20 milligram leaf weight possesses low magnetic permeability, good stability
and resistance to corrosion. Whether you own an Cahn microbalance, Mettler
micro balance or Sartorius micro-balance we can supply you with high quality
test weights to determine the accuracy.
This Ulti Mass Class U calibration leaf weight (WT20MGCLSUC), Flat Weight, ASTM
Shape, includes Certificate of Calibration and is traceable to National Institute
of Standards and Technology (NIST) standards. Individual weight is packed
in a plastic vial and then in bubble envelope. Typical lead time is 5
to 7 business days from the date order is placed to shipping from NVLAP metrology
lab located Arvata, Colorado.
Single-piece construction: Because the precise measurement of density
can only be achieved using a single piece weight, all Sartorius weights are
ASTM Type 1 single-piece weights. This weight contain no air cavity or
foreign adjusting material, thus providing the maximum mass stability.
In addition, it is an ASTM requirement that one-piece weights are used as standards
and where mass stability is required.
This Ulti Mass Class U Mass Standard provide the greatest precision we
offer. Ideal for use as reference standards to calibrate other weights.
Ideal for use as reference standards for use with the Cahn Micro-balance model
C-33, CAHN C-34 Microbalance, Mettler AX26 DeltaRange Micro Balance, Mettler-Toledo
UMX2 Micro-Balance, Sartorius
SE2 micro-balance, Sartorius
ME5 micro balance, Sartorius
MC21S micro balance, or Sartorius
CP2P micro balance to name a few micro balances.
The mass standards produced by Sartorius today are designed to meet or exceed
the standards of the American Society of Testing Materials (ASTM E617)
The
weight value can deviate above or below the nominal value by the
tolerance defined. To determine the tolerance of a mass, look
at the denomination or nominal value of the weight and the appropriate
class you need.
Custom
weight sets are available upon request by calling
Precision Weighing Balances at 978-521-7095
All
calibration weights are not returnable. Once your order
has been placed it CAN NOT be cancelled. Please carefully
consider this prior to placing your order. The reason for
this is these weights are custom manufactured and are certified
on the date they were made. In addition, if you touch the
calibration weight with your fingers the oil in your skin would
change the tolerance and we can not take this chance if the weight
was returned.
1mg
to 2g individual weights are packed in a plastic vial and then in
bubble envelope
5g to 50g individual weights are shipped in a high quality, durable
hard plastic weight case
100g to 5kg individual weights are shipped in a high quality, durable
hard plastic weight case with one (1) lint free glove
(7-10 days lead time for all calibration weights and mass sets)
Certificate of Calibration
The Certificate of Calibration report includes the nominal value and the
conventional mass correction value for each weight certified. It will
also list information on the standards the weights were compared against
including:
Uncertainty value
Identifying number
NIST test number
Date the standards were last calibrated
NVLAP laboratory code
Recertification Service Weight values can change over time due to scratches, fingerprints, wear
and even corrosion resulting from atmospheric contaminants. Regular
checks on the accuracy of mass standards ensures the accuracy of measurements.
The Sartorius mass metrology lab provides this service at a very competitive
price.
The current rates are listed below and subject to change. Typical
turn around time (excludes transit time) is 7-10 business days upon
receipt at the Arvada, Colorado metrology lab. You are responsible for
both in and out bound freight and insurance costs.
Single weights - $65
Two or more weights - $48 each
Weight sets of 15 or more weights - $37 each
Please call us at 978-521-7095 if you presently have calibrations
weights that require recertification.
What does calibration of a laboratory weight entail?
Sartorius
mass comparators compare a weight to a known mass (a NIST calibrated
reference weight) and report the difference, to a very small value.
These mass comparators can ascertain and measure differences to
10, 1, and even 0.1 micrograms (one ten-millionth of a gram), multiple
weighings, averaged, can resolve the differences to even smaller
amounts.
Calibration technicians must wear appropriate static free clothing,
as well as gloves, hair nets and face masks, to reduce the possibility
of contamination (and changing the weight of the weights) from skin
oils, hairs, or airborne droplets. Calibration weights are
never touched directly by human hands.
What is the difference in tolerance between Sartorius Ultra Class
U, Class 1, Class 2 and other calibration specifications?
Metric
Weight Tolerances - all tolerances stated in milligram (mg)
American
Society of Testing & Measurement ASTM E617
Denomi-
nation
Metric
Sartorius
Ultra
Class U
Class
1
mg
Class
2
mg
Class
3
mg
Class
4
mg
Class
5
mg
Class
6
mg
Class
7
mg
5
kg
6.00
12
25
50
100
250
500
1400
3
kg
3.80
7.5
15
30
60
150
300
1000
2
kg
2.50
5.0
10
20
40
100
200
750
1
kg
1.25
2.5
5.0
10
20
50
100
470
500
g
0.600
1.2
2.5
5.0
10
30
50
300
300
g
0.380
0.75
1.5
3.0
6.0
20
30
210
200
g
0.250
0.50
1.0
2.0
4.0
15
20
160
100
g
0.125
0.25
0.50
1.0
2.0
9
10
100
50
g
0.060
0.12
0.25
0.60
1.2
5.6
7
30
g
0.037
0.074
0.15
0.45
0.90
4.0
5
44
20
g
0.037
0.074
0.10
0.35
0.70
3.0
3
33
10
g
0025
0.050
0.074
0.25
0.50
2.0
2
21
5
g
0.017
0.034
0.054
0.18
0.36
1.3
2
13
3g
0.017
0.034
0.054
0.15
0.30
0.95
2
9.4
2
g
0.017
0.034
0.054
0.13
0.26
0.75
2
7.0
1
g
0.017
0.034
0.054
0.10
0.20
0.50
2
4.5
500
mg
0.005
0.010
0.025
0.080
0.16
0.38
1
3.0
200
mg
0.005
0.010
0.025
0.060
0.12
0.26
1
1.8
100
mg
0.005
0.010
0.025
0.050
0.10
0.20
1
1.2
50
mg
0.005
0.010
0.014
0.042
0.085
0.16
0.5
0.88
20
mg
0.005
0.010
0.014
0.035
0.070
0.12
0.5
0.56
10
mg
0.005
0.010
0.014
0.030
0.060
0.10
0.5
0.4
5
mg
0.005
0.010
0.014
0.028
0.055
0.080
0.2
2
mg
0.005
0.010
0.014
0.025
0.050
0.060
0.2
1
mg
0.005
0.010
0.014
0.025
0.050
0.050
0.1
The
table above is a listing of the tolerances of various classes of
masses. The weight value can deviate above or below the nominal
value by the tolerance defined. To determine the tolerance
of a mass, look at the denomination or nominal value of the weight
and the appropriate class you need.
Custom
weight sets are available upon request by calling
Precision Weighing Balances at 978-521-7095
All
calibration weights are not returnable. Once your order
has been placed it CAN NOT be cancelled. Please carefully
consider this prior to placing your order. The reason for
this is these weights are custom manufactured and are certified
on the date they were made. In addition, if you touch the
calibration weight with your fingers the oil in your skin would
change the tolerance and we can not take this chance if the weight
was returned.
Analytical Balances
money order
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