Precision Weighing Balances
Your online source for balances, scales & calibration weights @ discount prices

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The Sartorius GD503 has been discontinued and no longer in production as of May 2013. The Sartorius jewelry line was phased-out and at this time there is no direct replacement. We have no remaining stock on the GD503 and all information displayed herein is for archival and support purposes only. For benchrest shooters looking for our recommendation for an alternative balance to weigh bullets, reloads and brass case we ask you to look at the Sartorius Entris64-1S.

Looking for a balance that offers 100 gram weighing capacity and reads to 0.0001 grams or 500 carats x 0.001 carats the Sartorius GD503 is awesome. Totally unbelievable value. 500 carat balance readable to 0.001 carats that is Legal for Trade or if you want to weigh in grams 100 grams with readability to 0.0001 grams - YES 4 decimal places in grams. Sartorious GD503 comes with the 100 gram external calibration weight and dust cover at no additional cost.

GD503 balance comes with a 100 gram ASTM class 1 calibration weight, dust cover and RS-232 interface for connection to a computer or optional Sartorius YDP20-OCE printer. Only the Sartorius GD-503 comes standard with these items while competitive models typical charge big money for the calibration weight and a dust cover. Plus the GD503 has a 2 year manufacturer warranty. We dare you to compare and when someone tells you they can offer a similar balance for less give us a call and we'll help you understand what they are trying to sell you. It won't be made in the USA, it won't come with the calibration mass nor dust cover and it won't perform like the GD503 for the price we are selling the GD503.

Sartorius GD-503 is Legal for Trade. Customers told us they needed a high precision jewelry scale they could sell diamonds, precious and semi precious stones at trade shows like the Tucson JCK Gem Show. Some states like Arizona, New York, Florida don't play any games when it comes to weighing - you either have a Certified Class 2 balance to sell gems by weight or you're not selling any gems by weight until you get a Legal for Trade Scale.

When you're buying precious gems and minerals by the gram or carat they must be measured on an ntep scales. Investigators from the Arizona Department of Weights and Measures spend several days every year at the Tucson Gem and Mineral Show, where they checked scales used by dealers who were selling items by weight. At the 2006 Tucson Gem and Mineral Show they confiscated 145 scales that were being used illegally because they did not conform to NTEP standards. Arizona Weights and Measures doesn't fool around and they can impose Civil penalties under section 41-2115 up to $50,000 in some situations. Recently in Albany, New York inspectors from the county's Division of Weights and Measures raided a store for using the wrong scales and the owner faces fines up to $70,000.

At gem & lapidary trade shows you'll probably not be able to sell your gems unless they have a Legal for Trade type approved balance like the GD-503 that can meets the inspector's requirements. The GD503 weighs up to 500 carats weighing capacity with readability to 0.001 carats. In the Legal for Trade mode the GD503 offers a second weigh mode in grams - 100g x 0.0001g. Yes, that is correct the balance increments in in four decimal increment in the gram weigh mode.

A big selling point on the GD-503 in the low profile 5.23 inch high draft shield chamber (height from pan to top of glass door). The two side doors and top door slide open for fast & easy access to the weighing chamber. Jeweler's have limited space in their stores and the small footprint makes the Sartorius GD503 a big selling point.

We believe the GD503 is the best 3 decimal place carat scale on the market for price, performance, features and quality. Those needing to weigh 0.0001 grams we doubt you can find anything comparable. Made in the USA and engineered & designed by the best metrology engineers that Göttingen Germany has at Sartorius' advance weighing technology research lab.

Please scroll down on this we page and there are a ton of information and images to help you decide the Sartorius GD503 is the weigh to go.

Sartorius GD503 Class II Balance

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Brand Model Capacity Readability
Sartorius GD503 Class II Balance 100 g 0.0001 g
Add. Features
  • Carats
  • Grains
  • Milligrams
  • Pounds
  • Ounces
  • Pennyweight
  • Grams
  • Troy Ounces
  • Legal For Trade
  • RS-232c
  • NTEP Class II
Comparable Scales

A&D Weighing GH-120 analytical balance - $2832.00

A&D Weighing lab balance HR120 - $1863.00

Sartorius cubis analytical MSE124S-100-DU - $4909.50

Sartorius Secura124-1S analytical - $3412.75

A&D Weighing HR-100A analytical balance - $1382.00

Sartorius MSU124S-100-DU Balance - $5926.50

Adam Equipment PW184 Analytical Balance - $1845.00

Scientech Zeta ZSA120 Balance - $1795.00

Other Brands Precision Class 2 - 9 Pc Weight Set - $991.40

Other Brands Class 1 Traceable 21 pc Weight Set - $1523.70

Ohaus Adventurer AX124 AutoCal - $2857.70

A&D Weighing HR100AZ 4 Decimal Balance - $1725.00

A&D Weighing HR-150A scientific balance - $1478.00

Sartorius Practum 124-1S analytical - $1909.20

Ohaus analytical balance EX124 - $3616.75

Sartorius Quintix 124-1S analytical lab balance - $3077.00

Ohaus PA124 Pioneer Laboratory Balance - $1763.75

Sartorius Cal-pak calibration weight set 100g, 10g, 20mg - $345.60
MSRP: $1995.00
YOU PAY $1429.00

UPS Ground is FREE in the lower 48 states of USA
The GD503 has been discontinued since May 2013. No remaining stock is available.

For alternative models we recommend the Sartorius Entris64-1S or Entris124-1S. If you require Legal for Trade for weighing diamonds please review the Mettler Toledo JS703C/A.

Review this great 3-Way Comparison Test for Precision, Speed, Drift, Stability with the MyWeigh GemPro, AY123 (same as Acculab VIC123 & Denver Instrument MXX-123 all these models are discontinued and never replaced due to all the compliants about drifting), Sartorius GD503 (replaced by Entris64-1S) by JayChris @
Capacity x Readability (g) 100 g x 0.0001 g
Capacity x Readability (g) 100 g x 0.0002 g
Capacity x Readability (ct) 500 ct x 0.001 ct
Capacity x Readability (lb) 0.22085 lb x 0.00001 lb
Capacity x Readability (oz) 3.53361 oz x 0.00001 oz
Capacity x Readability (ozt) 3.22074 ozt x 0.00001 ozt
Capacity x Readability (GN) 1545.955 GN x 0.005 GN
Capacity x Readability (dwt) 64.4148 dwt x 0.0001 dwt
Capacity x Readability (mg) 100176.2 mg x 0.2 mg
Legal for Trade
(NTEP approved)
YES - CofC 05-099A1 Legal for Trade in gram & carat mode ONLY
NTEP Capacity x Readability (g) 100 g x 0.001 g
NTEP Capacity x Readability (ct) 500 ct x 0.01 ct
Reproducibility (std deviation)
carats (ct)
grams (g)
± 0.001 ct
± 0.0001 g
carats (ct)
gram (g)
± 0.002 ct
± 0.0002 g
Scale interval d 0.0001 g
Verification scale interval e 0.001 g
Response Time (average) 3 seconds
Tare Range FULL to Capacity
Selectable Weight Units
g, ct, lb, oz, ozt, tlh, tls, tlt, Gn, dwt, mg, parts/lb, tlc, mom, K, tol, bat, and MS.  In LFT mode the the GD503 weighs in Carat & Grams ONLY
Selectable Application Programs Mass unit conversion by toggling, tare memory, net total, weighing in percent, counting, averaging.  Counting function not legal for trade
Display Update 0.1 - 0.4 seconds depended upon filter level selected
Display LCD
Allowable Ambient Operating Temperature 20° C to 35° C (68° F to 95° F)
85% RH or less
Sensitivity Drift
(10° - 30°C/50°F-86°F)
± 2 ppm / °C
External Calibration 100g INCLUDED
Pan Size ø90 mm / 3.5 in
(standard round pan)
Draft Shield Chamber Height
(from pan to top of glass door)
133 mm / 5.23 in
Dimensions (entire balance)
W x D x H
200 x 270 x 233 mm
7.9 x 10.6 x 9.2 in
Built-in RS-232 Interface YES - RS-232 interface is standard but the RS-232 cable is optional
Weighing Below Not Available.  Common applications for weighing below the balance include density determination.
AC Power Source AC Adapter 120 VAC
Power Consumption Approx. 16VA (supplied by AC adapter)
Standard Equipment 120V AC Adapter, Dust Cover, Stainless steel weighing pan, 100g external cal mass
Optional Accessories Printer, RS-232 cable, RS-232 to USB converter kit, Rechargeable external battery pack, WinWedge data transfer software
Warranty 2 years manufacturer's warranty
Net Weight, Approx. 2.8 kg / 6.2 lbs.
Sartorius lab balance Brochure Sartorius lab scale Download the brochure loaded with tons of information.
Sartorious balance User Manual lab scales Download the Instruction Manual for the GD503 loaded with tons of information.

sartorius balance
Sartorius GD503 is ergonomically designed with a sleek look and rounded corners.  Standard bi directional RS-232 interface allows communication to a pc or Sartorius printer
Gun and ammo reloaders really need to watch the video above that one of our customers put online. See the Sartorius GD503 in action and where professional shooters all over the world are learning to forget those low cost strain gauge scales that don’t work (see this video to see the difference). Watch the reloading of bullets using the Sartorius GD503, Omega Powder Trickler and the RCBS Chargemaster. A kernel of Hogdgon H4350 powder weighs between 0.025 0.030 grains and the Sartorius GD503 increments in 0.005gn. If you are tired of all the headaches using digital scales in the past it is time for you to buy a real balance that can weigh correctly. Give us a call at 978-521-7095 and we will configure the GD503 so the balance works out of the box in grains. If you are buying a digital balance for reloading we really think you should buy the Sartorius GD503.
Review this great 3-Way Comparison Test for Precision, Speed, Drift, Stability with the MyWeigh GemPro, AY123 (same as Acculab VIC123 & Denver Instrument MXX-123 all these models are discontinued and never replaced due to all the compliants about drifting), Sartorius GD503 (replaced by Entris64-1S) by JayChris @
Sartorius Entris64-1S with the Omega 2-Speed Electric Powder Trickler can deliver the results the competitive benchrest needs to reload ammo to the kernel of powder. We use Hogdgon H4350 powder and show how the powder weighs between 0.020 -- 0.030 grains and how easy you can weigh accurate charges to the kernel. To weigh to the kernel of powder you need an analytical balance the weighs to 0.0001 grams. When the Sartorius Entris64-1S weigh mode is configured to grains the balance increments in 0.002 grain divisions. You will not be able to know every bullet is weighed to the kernel of powder with a milligram balance (0.001g) since most milligram balances increment in only 0.02 grains (See this video for proof).
In the video above we show ammunition reloaders wanting to weigh powder to a kernel they need to purchase an analytical balance that increments in 0.002 grain divisions/graduations. That is two thousandth of a grain.

Now just because a balance offers readability to 0.002 grain divisions/graduations does not mean it is accurate to ±0.002 grain. Readability is just what the balance's displays resolution. One needs to dig into the manufacturer's specification and look for the word "linearity" which is the accuracy of the balance. Depending on the manufacturer the linearity is ± 2d, 3d or some low cost Chinese made balances it could be 4d or 5d. Using the Sartorius Entris64-1S the linearity is stated as ± 2 divisions. The Entris64-1S increments in 0.002 grain divisions so the linearity is ± 0.004 grains. These manufacturer specs are performed by the manufacturer and done in controlled environments (temperature & humidity controlled, no static electricity issues, no radio frequency interference, perfectly stable air so there are no drafts). You have to have faith the manufacturer is honest in their testing and we have seen over and over again the no name brands stated specs do not correspond to the performance of the balance. Since testing is done in ideal environments you really can't expect the same performance and let's just say if the manufacturer states ±2d with your environment you'll get ±4d.

A kernel of Hodgon H4350 weighs between 0.020 - 0.030 grains per kernel. Each kernel weight varies. So for the Sartorius Entris64-1S I like to say when you have your balance level, balance warmed up for at least 30 minutes, in a stable environment realistically you'll expect to have accuracy to 0.008 grains (0.002gn x 4d = ±0.008gn). Now if you purchased a milligram balance the readability and linearity would be 10 times less of an analytical balance so the best performance you could expect is 0.08 grains. If a kernel weighs between 0.020 - 0.030 grains per kernel there is no way a milligram balance can deliver the consistent weighing results the competition benchrest shooting is looking for which is knowing each round of ammunition has the same amount of powder. Having ammo with an extra kernel or short a kernel will result in the bullet being high or low of the target's bullseye.

The RCBS10-10 mechanical beam scale finest graduation is 0.1 grains. The large poise increments in 10 grain divisions, the cylindrical micrometer poise has graduation to 0.1 grains and uses a gauge that increments in 1 grain divisions. One 360 degree rotation of the micrometer poise yield 1 grain.

If we say the average weight of a kernel of H4350 is 0.025 grains then 4 kernels weigh 0.1 grains, which is the best readability the RCBS 10-10 offers. It is not the accuracy since you are moving parts, friction points and the agate bearing the fulcrum pivots on wears. We'll use the Omega 2 Speed Powder Trickler from Daddy Products available at and we will dispense one kernel at a time to see how many kernels it takes to move the beam of the 10-10. Now watch closely as I drop one kernel while also looking at the beam pointer. I am going to press the BLACK button on the Omega Trickler and drop 1, 2, 3, 4 5 kernels. You'll notice it takes 4 to 5 kernels to see the beam even move. If you are doing any competition shooting and weighing powder with the 10-10 and other shooters are using an analytical balance you can see you are at a great disadvantage.

Now we will show you how to achieve weighing powder so you know each round is weighed to the kernel.

For many years those competition shooters wanting to weigh powder to the kernel purchased the Sartorius GD503. Since the GD503 are sold out Precision Weighing balances alternative to the GD503 is the Entris64-1S weighs up to 926 grains & increments in 0.002 grain divisions.

We show in the video above how the Entris64-1S can weigh to the kernel using the Omega 2 Speed Powder Trickler from Dandy Products available at
If you own one of those RCBS or Ohaus 10-10 mechanical beam scales they only weighed to 0.1 grains so they weren't really that accurate for ammo relaoders that wants to reload bullets with the same amount of powder. These mechanical scales are almost from the dinosaur ages.

Then came those low cost cheap digital scales where the scale's display changes even when you aren't even adding powder to the weighing platform since the weigh sensor was a cheap stain gauge. If you don't understand then watch this video HERE demonstrating a magnetic force restoration balance verses strain gauge scale.

The video above shows the Sartorius Entris313-1S milligram balance that weighs to 0.02 grains (5x greater readability than the 10-10, 02gn x 5 = 0.1gn). The Entris313-1S is a big step up from other mechanical beam scales and it isn't a strain gauge scales like the Acculab VIC123, Sartorius AY123, Denver MXX123, but as this video shows if you want to weigh to 1 kernel of powder you need greater accuracy than a milligram. Since a kernel of powder weighs between 0.020 - 0.030 grains you'll need an analytical balance like the Sartorius Entris64-1S.

In the video above we use the Omega 2-Speed Powder Trickler to dispense one kernel of powder at a time. If you are a competitive benchrest that needs to reload ammo to the kernel of powder then watch this video and buy an analytical balance.
pharmacy balance
High resolution with stability and very fast response for operator comfort and efficiency.  The GD503 comes standard with 120V AC Adapter, dust cover & Class F1 external 100 gram cal mass at no additional cost.
Sartorius GD503 Legal for Trade Balance

(select any of the options below and then the "BUY HERE" image)

Precision Weighing Balance Special Offer Must be Selected At Time of Purchase!
Product Details

Data Printer

sartorius AGOptions
Data Printer with statistics & time-date function $400.00
5 rolls of paper $25.00
Ink ribbon cassette $35.00
WinWedge Std Software with RS-232 cable $410.00
T-Connector (fits RS-232) $279.00
Remote Display, cable length 3 ft $415.00
RS232 Cable 9 pin and 25 pin, 5 ft, IBM type $80.00
RS-232 to USB converter kit for Sartorius Balances $109.99
220V AC Adapter $40.00
AD-1683 - Static Eliminator $1095.00
YIB01-OUR Ionizing Blower neutralizes static charges $1391.00
YSTP01 Stat Pen neutralizes static electricity on samples $1420.00
Granite Platform with isolators 13 x 15 inch $569.00
Locking Device, anti-theft for GD Series $65.00
Low Cost Aftermarket Universal Specific Gravity Kit $139.95

   calibration weights mass set traceable weight weights

100g ASTM Class 2 (± 0.50 mg) with NO Cert $72.00
100g ASTM Class 1 (± 0.25 mg) with NO Cert $92.00
100g ASTM Class 1 (± 0.25 mg) with NVLAP Cert $145.00
50g ASTM Class 2 (± 0.25 mg) with NO Cert $62.00
50g ASTM Class 1 (± 0.12 mg) with NO Cert $76.00
100g ASTM Class 1 (± 0.25 mg) with NVLAP Cert $145.00
1g-200g 10 piece Class 1 Mass Set with NVLAP Cert $1210.00
9 pc. Weight Set (100 g - 1 g) Class 1 with NVLAP $1042.00
1mg-100g 21 Piece Class 1 Weight Set with NVLAP Cert $2059.00
Cal-Paks 100g, 10g, and 20mg Class 1 with NVLAP $331.00
Cal-Paks 100g, 10g, and 200mg Class 1 with NVLAP $331.00
Cal-Paks 100g, 10g, 2g Class 1 with NVLAP $355.00
Prescription balance   certified prescription scales
Image taken from the rear of the
GD-503.  Features RS-232 interface.
  Polished stainless steel weighing pan, ring and floor makes cleaning simple.
pharmacy oompounding balance   Class A prescription balance
Innovative high-grade draft shield with low profile design resulting in less bench space compared to conventional analytical balances (height from pan to top of glass door is only 5.23 inch).  Draft shield offers 3 sliding doors that slide open quietly and effortlessly.   Leveling the balance with the 2 front adjustable feet is a breeze.  The identification badge is located on the left side of the GD503 Class II NTEP Approved Balance in accordance to National Conference on Weights and Measures.
carat balance   Certified gram lab balance
Balance set in LFT mode in carats.  Notice the last digit is "boxed"   Balance set in LFT mode in grams.  Notice the last digit is "boxed"
Handbook 44 scale   weighing device
Bottom side of GD503 balance shows the two front adjustable feet and tamper evident sticker across access plate and the balance housing.   When the balance is used in legal metrology (a.k.a NTEP mode) external calibration is blocked by a seal over the access plate.
calibration sealIn accordance with weights and measures regulation the balance must be sealed to prevent tampering and re-calibration once the balance is placed in service.  To prevent access to the calibration switch a tamper evident seal is placed across the access plate and bottom housing.

The Weights and Measures Inspector will place this seal on the balance once the inspector has tested the balance and places the balance in service as a legal for trade device.
Handbook 44 Section 2.20 requires the identification badge specify the model number, serial number, "d" - display division, "e" - verification scale interval and the National Type Evaluation Program Certificate of Conformance (NTEP CC)
Balance is set to non-NTEP mode since the least significant digit is not "boxed"
Balance is set to NTEP mode since the least significant digit is "boxed"
sartorius quality balances   sartorius lab equipment
Spectacular packing insures your analytical balance is delivered without damage.   Styrofoam packing surrounds your Sartorius Analytical Balance lessen the chances of any damage due to rough handling by the shipping carrier.  Like we always say - to the shipper like UPS, fragile means football and the Sartorius is designed to handle the delivery.
legal for trade mode
Easy-to-clean display that is highly resistant to chemicals.  High contrast LCD (height of digits: 13 mm / 0.5")

Keys with positive click action for reliable and confident activation of specific functions.  Keypad holds its shape even after repeated use.  Toggles between two selected weigh units at the touch of a key

Easy-access, all-glass weighing chamber and easy-to-remove and easy-to-clean high-grade stainless steel weighing pan.  Weighing chamber base plate is easy to clean because all parts can be simply removed

sartorius scale GD603 balance using usb interface to computer
Shown above is the Sartorius GD503 Precision Diamond Scale interfaced with a laptop.
"We did not invent the product, but we made it better" is a famous quote from BASF and we feel the same with our new RS-232 to USB converter kit for Sartorius Balances exclusively found at Precision Weighing Balances.  Your Authorized Sartorius Dealer and known throughout the world for deep discount prices.

Our USB to Serial Adapter kit for Sartorius Balances (our part # SARUSB) offers you the best of both world.  If you want to interface the Sartorius Scale with a RS-232 serial port you simply disconnect the 1 foot RS-232 to USB cable.scale usb cable

Eliminate IRQ conflicts by going USB.  Connect your Sartorius balance to any PC running the Windows OS using HyperTerminal or purchase a third party software wedge.  We offer step by step instructions how to use HyperTerminal here.

This kit's only $109.99 and it's custom made for

specific gravity kit
Low cost aftermarket optional specific gravity kit is available for $139.95.  The kit includes all the items shown below. Read more about this product here and how it works.
density determination kit

Select from 6 different precision Jewelry Scales for your specific weighing

Capacity x Readability

Internal Cal Price
GD503-NTEP 100 g x 0.0001 g NO $1429.00
GD603 121 g x 0.0002 g NO $1429.00
GCA1603P 0 - 160 g x 0.0002 g
160 - 320 g x 0.002 g
YES $2429.95
GCA2502 500 g x 0.001 g YES $2049.95

620 g x 0.001 g

YES $1999.99

6200 g x 0.01 g

YES $1999.95

sartorius analytical balance
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