Precision Weighing Balances
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AND FX-300iN is a legal for trade weighing device. This digital balance offers 320 grams weighing capacity that displays to 0.001 gram division with the verification scale division of 0.01 grams. The FX300iN is popular for pharmacies requiring a Class "A" prescription scale to maintain their pharmacy license when the requirements are a weighing device with a minimum tolerance of 0.1 grains or 6 milligrams.

The FX300iN legal for trade digital scale is NTEP approved (National Type Evaluation Program) complying with the applicable technical requirements of "NIST Handbook 44: Specifications, Tolerances and Other Technical Requirements for Weighing and Measuring Devices".

The "d" (value of scale division) is 0.001 grams and the "e" (value of verification scale division) is 0.01 grams. When "d" and "e" are not the same value the last division on the scale's display is "boxed". If you placed a gold chain on the FX300iN the display might read 245.02[2] grams. So the item weighs 245.022 grams and since "d" and "e" are not equal the last decimal is uncertain. A pawnbroker should tell the customer - you have 245.02 grams.

Jewelry and pawnshops in Minnesota weighing gold, platinum, palladium or rhodium when the metal is bought or sold by weight select the AND Weighing FX300iN. The FX-300iN meets the strict Minnesota's Weights & Measures Division Precious Metals Scale Requirements requiring scales used for precious metal transactions have an "e" less than or equal to 0.01 grams.

Retail marijuana dispensary store that sells less than 1 ounce in Oregon W&M Inspectors will only accept "e" with a division value of 0.01 grams or less. The FX-300iN meets the requirements to comply with the medical marijuana dispensary requirements for a weighing device in Oregon.

The FX-300iN is a Class II weighing devices. Handbook 44 defines a Class II balance as any weighing device with 10,000 - 100,000 verified divisions. Since the FX-300iN weighs up to 320 grams and "e" is equal to 0.01 grams it is therefore 32,000 verified divisions. All this information can be verified by downloading the CofC # 08-045A2

Weights & Measures Inspectors uses the guidelines in Table 8 of section 2.20 Scales in NIST Handbook 44, 2.2 Theory of Tolerances in Appendix A for determining the applicable scale for the weighing application such as weighing gold. You can download sections of NIST Handbook 44 - 2012 Edition here.

Table 8 says that the smallest item weighed on a class II scale with a verification scale division size of 0.1g should weigh at least 5 grams (50 divisions) - the FX2000iN meets this description. The smallest item weighed on a class II scale with a verification scale division size of 0.01 gram should weigh at least 0.2 grams (20 divisions) - the FX300iN meets this description. Pawnbrokers and cannabis retailers typically weigh items under 5 grams so to comply with the laws we recommend the FX-300iN.

The Theory of Tolerances states that the tolerance allowed on a commercial device should not cause economic injury to either the buyer or the seller. A class II scale with a verification scale division size 0.1 gram is allowed 1 division (0.1 g) maintenance tolerance for weights between 0 and 500 grams. So if you had a known weight and we'll say a 300g calibration weight weighing on an LFT NTEP scale with a verification scale division of 0.1 gram the NTEP scale could read 299.9g, 300.0g or 300.1g and be within tolerance.

If medical marijuana shops are selling cannabis for $20 a gram to medical cannabis patients and the average purchase amount at dispensaries is less than 5 grams let us demonstrate economic damage. If a client wants to purchase 1 gram weighed on a Class II scale with a verification scale division size 0.1 gram it is allowed 1 division (0.1 g) of error. So that is either $2.00 you are shorting the customer(buyer) or dispensary(seller) if weighing on the FX2000iN.

Now if the same the medical marijuana dispensary is weighing on the FX-300iN that has a verification scale division size 0.01 gram it is allowed 1 division (0.01 g) of error resulting in either 20 cents you are shorting the customer(buyer) or dispensary(seller). Now you can see why we always recommend buying a more accurate weighing device since although you may think the scale always weighs to benefit the seller you just may be short changing yourself. You could be giving away $2.00 for each customer leaving your store when you buy the wrong scale.

For these reasons, the Minnesota Weights & Measures Division requires that scales used for precious metal transactions have an "e" less than or equal to 0.01 g and the A&D Weighing FX-120iN, FX-200iN & FX-300iN meets the requirements.

You should always check with your local state or county Weights & Measures office to determine their exact requirements for a scale. Many states like Minnesota have very strict penalties for any person buying or selling precious metals by weight and using the wrong scale could result in a criminal penalty if found guilty of imprisonment for not more than three years or to payment of a fine of not more than $40,000, or both.

One of the reason there are not a lot of digital scales that are legal for trade is because the scale has to really measure correctly. The scale needs to incorporate a high quality precision weigh sensor and electronics. During evaluation process a load of one-half capacity is placed on the digital scale more than 100,000 times testing for accuracy and functionality. There are also device markings and design requirements to prevent the scale from being calibrated once placed in service. This is achieved by sealing the FX-300iN by threading a wire security seal through two screws on the RS-232 serial interface plate and scale housing. This prevents access to the calibration switch inside the device.

When the FX-300iN digital balance is first installed it should be calibrated to ensure accurate weighing results. We offer a full line of calibration weights including the recommended OPTIONAL 300 gram calibration weight for the FX-300iN. Every location in the world is positioned differently to "magnetic north" and therefore the acceleration of gravity is slightly different. Some Weights & Measures Inspectors will calibrate your FX-300iN when they come and inspect the balance and put it into service. Other states required only a licensed certified scale technician to perform calibration and they charge up to $225 just to place the calibration weight on the weighing platform. Some states will allow you to calibrate your own balance. If you are allowed to calibrate your own balance make sure you watch our youtube video how we walk you through the calibration process. Instead of buying the 300g ASTM Class 1 with NVLAP Certificate you can probably save money buy purchasing the 300g ASTM Class 2 (± 1.5 mg) with NO Certificate for $82 in the option section below. Again you should check with your Weights & Measures Division about calibration especially since calibration weights are not returnable.

We understand purchasing a legal for trade balance is a major capital expense and if you have any questions give us a call and one of our weighing experts can discuss your weighing application and get you the most affordable balance for your weighing needs.

A&D Weighing FX300iN NTEP approved class 2 scale

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Brand Model Capacity Readability
A&D Weighing FX300iN NTEP approved class 2 scale 320 g 0.001 g
Add. Features
  • Carats
  • Pounds
  • Ounces
  • Pennyweight
  • Grams
  • Troy Ounces
  • Legal For Trade
  • Parts Counting
  • RS-232c
  • NTEP Class II
Comparable Scales

Sartorius Entris323i-1S Internal Cal Balance - $1240.00

Sartorius Quintix 313-1S balance - $1946.50

Sartorius Practum 313-1S milligram balance - $1172.90

Sartorius ENTRIS 423-1S chemistry balance - $1003.20

Sartorius Secura 313-1S milligram - $2269.50

Sartorius ENTRIS323-1S chemical weighing - $849.60

Ohaus AX423N/E NTEP Class II Scale - $1786.70

A&D Weighing GF-200P Pharmacy Balance - $1066.00

A&D Weighing GF300P Prescription Scale - $1237.50

Scientech Jewelry Scale ZSE250 - $1795.00

Ohaus AX423N NTEP Class II Int Cal - $2104.60

Ohaus EX423 electronic lab balance - $2877.25

Other Brands 200g cylindrical mass with NVLAP - $193.00

Scientech ZSP150NJ Mg Balance - $1350.00

Scientech ZSP400NJ Milligram Scale - $1544.00

Ohaus EX223 milligram lab balance - $2371.50

Ohaus AX223N/E Class II Ext Cal - $1533.40

Ohaus Pioneer PA323 Milligram Balance - $1028.50

Mettler Toledo JS703C/A carat balance - $1899.00

Ohaus SJX323N/E Class II Carat Scale - $499.25

Mettler Toledo JS1603C/A diamond scale - $2199.00

A&D Weighing FX700CT Milligram Balance - $999.97

Sartorius Cal-pak calibration weight set 200g, 20g, 2g - $386.00

A&D Weighing FX120iN NTEP Class 2 approved scale - $795.90

A&D Weighing FX200iN NTEP Approved Legal For Trade - $821.10

A&D Weighing FX1200iN NTEP type approved scale - $821.10

A&D Weighing FX2000iN NTEP medical marijuana dispensary - $856.80

A&D Weighing FX3000iN weigh medical marijuana - $884.80
MSRP: $1210.00
YOU PAY $863.80
Untitled Document
LFT approved balance

Precision Balance A&D FX300iN - 5 year warranty
PWB Price AND Weighing NTEP Approved Digital Scales $863.80
A&D won't let us advertise a price below $863.80 for the FX300iN, but when you click the buy icon your cost will be LOWER
Shipping & Handling $27.50
Capacity x Resolution (grams) 320 x 0.001 g
Capacity x Resolution (ounces) 11.28 x 0.00005 oz
Capacity x Resolution (pounds) 0.705 x 0.000005 lb
Capacity x Resolution (pound:ounce) N/A with FX-iN models
Capacity x Resolution (troy ounces) 10.28 x 0.00005 ozt
Capacity x Resolution (carats) 1600 x 0.005 ct
Capacity x Resolution (pennyweight) 206.2 x 0.001 dwt
Capacity x Resolution (grains) N/A with FX-iN models
Counting Mode
Min. Unit Mass
0.001 grams
Counting Mode
# of Samples
5, 10, 25, 50 or 100 pieces
Percent Mode
Min. 100% Ref. Mass
0.100 grams
Percent Mode
Min. 100% Display
0.01%, 0.1%, 1%
(depends on the
reference mass stored)
Repeatability (Std. Deviation) 0.001 grams
Linearity 0.002 grams
Stabilization Time
(typically set at FAST)
Approximately 1 second
Sensitivity Drift
(10C to 30C)
2 ppm / C
Sensing Method Compact Super Hybrid Sensor (SHS)
Breeze Break Small Breeze Break 3.4" high (Included)
Operating Temperature 5C to 40C (41F to 104F), 85% RH or less (No condensation)
Legal For Trade CofC # 08-045A4
Display Type Vacuum Fluorescent Display (VFD)
Display Refresh Rate 5 times / second, 10 times / second or 20 times / second
Std. Serial Interface RS-232C Interface
Weighing Pan (diameter) 5.1" / 130 mm
External Calibration
(Not included)
300 grams
200 grams
100 grams
AC Adaptor 120V AC Adapter Included.  This balance runs on AC Adapter only, will NOT run on standard off the shelf alkaline batteries.
Power Consumption Approximately 11 VA
(supplied to the AC Adaptor)
External Dimensions
7.6" x 10.3" x 3.3"  
193 mm x 262.5 mm x 84.5 mm
Net Weight Approximately 6 lbs
Scale Features Toploaders  Precision Balance  Precision Toploaders  Precision Weighing Balances  Accurate Weighing  Gram Balance  Pharmaceutical Balances  Laboratory Balances  Precise Weighing  Electronic Lab Balance  High Precision Scales  A&D Weighing  AND Toploaders 
AND Precision BalancesBrochure Milligram Scales Click Here To Download For More Information
High Precision BalanceQuick Start Digital Lab Balance Download For Additional Information
Electronic Precision BalanceUser Manual Lab Balances Download Manual For Operating Instructions
Download the FX/iN Series Instruction Manual (2.02 MB) now A&D Precision Weighing
You need Adobe Acrobat Reader to view.  The instruction manual contains detail information regarding calibration, additional features and keypad functions.

There is a lot of confusion when it comes to buying the FX-i NTEP digital balances and hopefully this youtube video above will clear those issues up do you don't purchase the wrong balance.
In the youtube video above we take you step by step how to calibrate the AND Weighing FX-300iN Legal for Trade digital scale. You'll see how to open the RS-232 serial interface plate and press the calibration buttion to initialize calibration. The calibration procedure is similar for all the FX-iN Series except the only difference would be the exact calibration weight required for the particular model. The steps to perform calibration are entirely different compared to the Non-NTEP models for the FX-i Series.
A&D Milligram Balance
Top View of FX-i series A&D Precision Balance
In the youtube video above we show you the FXi-10 small breeze break and the FXi-11 large breeze break. The draft shield prevents air currents from causing the weighing pan disturbances, which results in fluctuating unstable readings. By protecting the balance's weighing platform with a draftshield a constant weight reading can be observed.

The FXi-10 small breeze break comes standard with the FX/FZi milligram balances(0.001 gram) and can be upgraded by purchasing the optional FXi-11 large breeze break. The FX/FZi precision balances (those that increment in 0.01 gram divisions) do not come with any windshield, but can be purchased with either optional accessory FXi-10 small breeze break or FXi-11 large breeze break.

The A&D FX/iN Legal For Trade NTEP approved Class 2 series precision balances come in several weighing capacities to accommodate your specific weighing needs.  Choose between 0.01 gram or 0.001 gram increments.  New FXi Precision scales with milligram resolutions include a small breeze break for precise weighing.  Get accurate weighing results with the latest precision scale from A&D!

See all new A&D precision balance models
Additional Precision Balance Features:
AND Weighing
In the youtube video above we offer an overview of the AND Weighing FX-300iN discussing the sprint bubble and how important it is to level the balance, the 6 tactile keypads and the functions of these keys. Watch how to change the weigh modes and how simple it is to go from grams to ounce to grains. See the spill guard / plastic cover, the two(2) adjustable feet, RS232 serial interface, weigh below port and many other features that are available with most of the FXi/FZi Series.
A&D Toploaders
AND Precision Toploader's Physical Dimensions
AND Precision Weighing
Milligram Scale's Dimensions Utilizing Breeze Break

A&D FX-iN Series Precision Balances
Download the User Manual (2.02 MB)

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

FX-i Series Precision Balances

Universal Specific Gravity Kit $139.95
Quick USB interface (FXi-02), Uni-directional $87.00
Ethernet Interface with WinCT-Plus Software $480.00
USB to 9 pin RS-232 Converter $55.00
Built-in Rechargeable Battery $320.00
Large Breeze Break 7.9 inches high $133.00
Protective In-Use Cover (each) $17.00
AD-8127 Impact Dot Matrix Printer $867.00
  External Weights Weighing Mass Mass Weights External Calibration
Calibration Weights

300g ASTM Class 2 (± 1.5 mg) with NO Cert $87.00
300g ASTM Class 1 (± 0.75 mg) with NVLAP Cert $204.00
200g ASTM Class 2 (± 1.0 mg) with NO Cert $87.00
200g ASTM Class 1 (± 0.50 mg) with NVLAP Cert $252.00
100g ASTM Class 2 (± 0.50 mg) with NO Cert $72.00
100g ASTM Class 1 (± 0.25 mg) with NVLAP Cert $145.00
1g-1000g 13 piece Class 1 Mass Set with NVLAP Cert $2933.00
1g-500g 12 piece Class 1 Mass Set with NVLAP Cert $2343.00
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 $1095.00
1mg-100g 21 Piece Class 1 Weight Set with NVLAP Cert $2059.00
Cal-Paks 200g, 20g, 200mg Class 1 with NVLAP $379.00
Cal-Paks 200g, 20g, 2g Class 1 with NVLAP $386.00

Note: See our complete line of certified weights and weight sets here

precision balances
FX-120iN, FX-200iN, FX300iN NTEP approved class 2
models come standard with small draft guard.
The other FX-iN precision models offer a breeze break sold separately.

Select from 34 Precision Balances to meet your specific weighing needs.
Model Cap x Read IP65 Legal For
FX-120iN 122 x 0.001 g NO YES included 5.1" $795.90
FX-200iN 220 x 0.001 g NO YES included 5.1" $821.10
FX-300iN 320 x 0.001 g NO YES included 5.1" $863.80
FX-1200iN 1220 x 0.01 g NO YES optional 5.9" $821.10
FX-2000iN 2200 x 0.01 g NO YES optional 5.9" $856.80
FX-3000iN 3200 x 0.01 g NO YES optional 5.9" $884.80

Model Cap x Read IP65 Legal For
FX-120i 122 x 0.001 g NO NO included 5.1" $770.00
FX-200i 220 x 0.001 g NO NO included 5.1" $806.00
FX-300i 320 x 0.001 g NO NO included 5.1" $833.00
FX-500i 520 x 0.001 g NO NO included 5.1" $973.00
FX-1200i 1220 x 0.01 g NO NO optional 5.9" $770.00
FX-2000i 2200 x 0.01 g NO NO optional 5.9" $806.00
FX-3000i 3200 x 0.01 g NO NO optional 5.9" $833.00
FX-5000i 5200 x 0.01 g NO NO optional 5.9" $973.00

Model Cap x Read IP65 Legal For
FX-120iWP 122 x 0.001 g YES NO included 5.1" $1113.75
FX-200iWP 220 x 0.001 g YES NO included 5.1" $1173.75
FX-300iWP 320 x 0.001 g YES NO included 5.1" $1252.50
FX-1200iWP 1220 x 0.01 g YES NO optional 5.9" $1113.75
FX-2000iWP 2200 x 0.01 g YES NO optional 5.9" $1173.75
FX-3000iWP 3200 x 0.01 g YES NO optional 5.9" $1252.50

Model Cap x Read IP65 Legal For
FZ-120i 122 x 0.001 g NO NO included 5.1" $885.50
FZ-200i 220 x 0.001 g NO NO included 5.1" $911.00
FZ-300i 320 x 0.001 g NO NO included 5.1" $977.25
FZ-500i 520 x 0.001 g NO NO included 5.1" $1113.00
FZ-1200i 1220 x 0.01 g NO NO optional 5.9" $910.00
FZ-2000i 2200 x 0.01 g NO NO optional 5.9" $945.00
FZ-3000i 3200 x 0.01 g NO NO optional 5.9" $977.25
FZ-5000i 5200 x 0.01 g NO NO optional 5.9" $1113.00

Model Cap x Read IP65 Legal For
FZ-120iWP 122 x 0.001 g YES NO included 5.1" $1368.75
FZ-200iWP 220 x 0.001 g YES NO included 5.1" $1432.50
FZ-300iWP 320 x 0.001 g YES NO included 5.1" $1548.75
FZ-1200iWP 1220 x 0.01 g YES NO optional 5.9" $1368.75
FZ-2000iWP 2200 x 0.01 g YES NO optional 5.9" $1432.50
FZ-3000iWP 3200 x 0.01 g YES NO optional 5.9" $1548.75

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