ATP E-Catalogue 2025 - Catalog - Page 78
OIML Class E1, E2, F1, F2, M1, M2 & M3 Calibration Weights
The "OIML" Recommendations for Weights
HOW TO ORDER
The "Organisation International de Métrologie Légale" has defined exactly
the metrological requirements for weights in the area of compulsory
verification worldwide. Most countries are members of OIML.
To order weights the product code is made up of 2 parts:
First the class. Second the nominal value. Example:
E1-50mg equates to:- E1 class, 50 mg nominal value.
M1-10kg equates to:- M1 class, 10 kg nominal value.
OIML Recommendation R111 (Edition 1994) refers to weights from 1 mg to
50 kg. Declarations are made regarding among other aspects, accuracy,
materials, geometric form, identification and preservation.
Classes of Accuracy, E1 to M3
The classes of accuracy are graded in strictly hierarchical fashion
in a ration of 1:3, where E1 is the most accurate and M3 being the
least accurate class of weights. When checking weights amongst
themselves the highest class is always the correct class for
control.
Test Weights (Standard)
When a comany is certified for quality assurace to ISO 9001-9003
it accepts the obligation, in respect of control of measuring
equipment, to periodically test or have all of its measuring
instruments tested. This testing must be documented.
Correspondingly, this applies equally to good laboratory practice
(GLP) and test laboratories to EN 45001.
Handling Accessories
Weight Classifications & Materials
E1
Weight standards of the highest accuracy class, mostly only as Reference
Standards for metrological services.
Stainless steel.
E2
Weight standards, the most accurate test or adjusting weights for highresolution, high-precision balances I over n* = 100,000d.
1 mg to 20 kg stainless steel.
F1
High-precision weights suitable for testing, calibrating and adjusting most
high-precision balances I up to approx n* = 100,000 d.
1 mg to 20 kg stainless steel.
F2
High precision weights suitable for very accurate precision balances II with
a
resolution up to approx. n* = 50,000d
1 mg to 20 kg stainless steel.
M1
Precision weights for precision balances II and trade balances III up to n* =
10,000 d. For weighing with mechanical gold and carat balances.
1 mg to 2 kg stainless steel.
5 kg to 20 kg cast iron.
M2
Precision weights for testing, calibrating and adjusting trade balances III and
IV with a resolution of less than n* 5,000d.
1 g to 2 kg stainless steel.
5 kg to 20 kg cast iron.
M3
Trade weights for everyday use with mechanical platform scales, decimal
balances etc.
5 kg to 20 kg cast iron.
Weights should not be touched or handled as this will change the
value and degrade the weight. Always use a handling glove or tool.
Calibration Weights
Calibration Certificates
Individual certificates of calibration are available. Prices on
application.
Prices include the following:
E1 weights are supplied in a wooden box.
E2 & F1 weights are all supplied in a plastic box.
F2 weights are supplied in a plastic box except 20 kg.
M1 & M2 weights are supplied in a plastic box except 5 kg,
10 kg & 20 kg. M3 weights are not supplied in a box.
Weights under 100 mg are for reference purposes only and cannot
be calibrated.
Price List - Calibration Weights
Classes of Accuracy OIML - Tolerance (mg)
Nominal
Weight
E1
E2
F1
F2
M1
M2
M3
Nominal
Weight
E1
E2
F1
F2
M1
M2
M3
1 mg
£140.00
£32.00
£18.00
£13.00
£8.00
N/A
N/A
1 mg
±0.003
±0.006
±0.02
±0.06
±0.2
N/A
N/A
2 mg
£140.00
£32.00
£18.00
£13.00
£8.00
N/A
N/A
2 mg
±0.003
±0.006
±0.02
±0.06
±0.2
N/A
N/A
5 mg
£140.00
£32.00
£18.00
£13.00
£8.00
N/A
N/A
5 mg
±0.003
±0.006
±0.02
±0.06
±0.2
N/A
N/A
10 mg
£140.00
£32.00
£18.00
£13.00
£8.00
N/A
N/A
10 mg
±0.003
±0.008
±0.025
±0.08
±0.25
N/A
N/A
20 mg
£140.00
£32.00
£18.00
£13.00
£8.00
N/A
N/A
20 mg
±0.003
±0.01
±0.03
±0.1
±0.3
N/A
N/A
50 mg
£140.00
£32.00
£18.00
£13.00
£8.00
N/A
N/A
50 mg
±0.004
±0.012
±0.04
±0.12
±0.4
N/A
N/A
100 mg
£140.00
£32.00
£18.00
£13.00
£8.00
N/A
N/A
100 mg
±0.005
±0.016
±0.05
±0.16
±0.5
N/A
N/A
200 mg
£140.00
£32.00
£18.00
£13.00
£8.00
N/A
N/A
200 mg
±0.006
±0.02
±0.06
±0.2
±0.6
N/A
N/A
500 mg
£140.00
£32.00
£18.00
£13.00
£8.00
N/A
N/A
500 mg
±0.008
±0.025
±0.08
±0.25
±0.8
N/A
N/A
1g
£139.00
£66.00
£41.00
£26.00
£11.00
£11.00
N/A
1g
±0.01
±0.03
±0.1
±0.3
±1
±3
N/A
2g
£146.00
£67.00
£41.00
£27.00
£12.00
£12.00
N/A
2g
±0.012
±0.04
±0.12
±0.4
±1.2
±4
N/A
5g
£156.00
£70.00
£43.00
£29.00
£12.00
£12.00
N/A
5g
±0.016
±0.05
±0.16
±0.5
±1.6
±5
N/A
10 g
£163.00
£74.00
£44.00
£31.00
£12.00
£12.00
N/A
10 g
±0.02
±0.06
±0.2
±0.6
±2
±6
N/A
20 g
£171.00
£84.00
£46.00
£32.00
£18.00
£18.00
N/A
20 g
±0.025
±0.08
±0.25
±0.8
±2.5
±8
N/A
50 g
£196.35
£89.00
£55.00
£36.00
£19.00
£19.00
N/A
50 g
±0.03
±0.1
±0.3
±1
±3
±10
N/A
100 g
£243.00
£99.00
£60.00
£40.00
£22.00
£23.00
N/A
100 g
±0.05
±0.16
±0.5
±1.6
±5
±16
N/A
200 g
£290.00
£126.00
£66.00
£52.00
£28.35
£27.00
N/A
200 g
±0.1
±0.3
±1
±3
±10
±30
N/A
500 g
£383.00
£77.00
£46.00
£46.00
N/A
500 g
±0.25
±0.8
±2.5
±8
±25
±80
N/A
1 kg
£596.00
£304.00
£138.00
£111.00
£70.00
5
£70.00
N/A
1 kg
±0.5
±1.6
±5
±16
±50
±160
N/A
2 kg
£813.00
£467.00
£227.00
£174.00
£129.00
£129.00
N/A
2 kg
±1
±3
±10
±30
±100
±300
N/A
£1,351.00 £706.00
£362.00
£316.00
£79.00
£79.00
£75.00
5 kg
±2.5
±8
±25
±80
±250
±800
±2500
10 kg
£2,093.00 £1,094.00 £594.00
£604.00
£136.00
£136.00
£129.00
10 kg
±5
±16
±50
±160
±500
±1600
±5000
20 kg
£5,758.00 £3,296.00 £2,699.00 £855.00
£253.00
£253.00
£243.00
20 kg
±10
±30
±100
±300
±1000
±3000
±1000
5 kg
£208.00 £105.00
3 View
Product 4
Price List - Handling Accessories
Model No.
Description
Class
Weight Size
Price
MF-100
100 mm stainless steel forceps
F2, M1, M2
1 mg to 50 g
£19.00
MF-105
105 mm stainless steel forceps
E1, E2, F1
1 mg to 50 g
£21.00
MF-205
250 mm stainless steel forceps
E1, E2, F1
500 g to 2 kg
£67.00
MWF-5
Weight fork
E1, E2, F1, F2
5 kg weights
£67.00
MHG-1
White cotton/lint handling gloves
-
-
£4.50
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