- Single weight
- OIML Class E1
- knob shape
- polished stainless steel
- Tolerance: ± 0,01 mg
- Plastic protective case
- Quality from KERN Germany
Included documents
- Technical data sheet
- Declaration of Conformity (OIML R111)
- Calibration certificate (option)
For centuries now, weight pieces have been used in scales for weighing procedures. This original purpose has now almost disappeared. Today, weights are used almost exclusively for adjusting and testing = calibration of electronic balances. They are now named “test weights” as this is their contemporary purpose.
Adjusting a balance means that you are intervening in the weighing system, to make sure that the display is set to show the correct nominal value.
With calibration on the other hand, there is no intervention, you are testing whether the display is correct and documenting any deviation.
The internationally valid OIML norm R111:2004 classifies test weights hierarchically in accuracy classes, where E1 is the most accurate and M3 is the least accurate weight class. With KERN you get the whole test weight range in all OIML accuracy classes E1, E2, F1, F2, M1, M2, M3.
As the test weight only becomes an ISO 9000ff-compliant test instrument when its accuracy has been proven, we offer the appropriate DAkkS Calibration certificate or verification certificate (in connection with a box) for all KERN test weights. For further details see chapter DAkkS Calibration Service.
We offers you the appropriate test weight package for your balance, consisting of the test weight, box and DAkkS-calibration certificate, as proof of its accuracy. The best prerequisite for a correct adjustment or checking of your scales.
Classes of accuracy of test weights E, F, M and their general relation to the types of balances:
Test weights for customers who require a high degree of accuracy for the most demanding applications. For high-resolution balances with d > 1,000,000 Use recommended with DAkkS calibration certificate only.
Most accurate test weights for high resolution analytical balances of verification class I ≥ 100,000 e
Test weights for analytical balances/precision balances for verification class I/II ≤ 100,000 e
Test weights for precision balances of verification class II ≤ 30,000 e
Test weights for industrial and commercial scales of verification class III ≤ 10,000 e
The appropriate test weight for your new KERN balance can also be found directly in the accessories of the balance in our webshop.
To protect your test weights we can offer you an appropriate weight case. If there are no legal or normative specifications, then you have the choice between plastic, aluminium protected or wood. The available weight cases are shown as a symbol in the test weight tables on the following pages. This way you have all the materials, versions, sizes and prices at a glance, listed in a concise way.
A balance can never be more accurate than the test weight that is used to adjust it, it all depends on its tolerance. The accuracy of the test weight should correspond to the readout [d] of the balance, or rather be more precise.
Nominal weight value is shown in adjust mode “CAL” in the balance display. Given a choice, the heaviest weight is the most suitable for accurate measurement.
Once accuracy and nominal weight value are specified, the suitable test weight is selected according to the tolerances “Tol” of the indi vidual accuracy classes E2 – M3, see column “Tol ± mg” at the respective weight.
Balance with weighing range [Max] 2000 g = 2 kg and readout [d] = 0,01 g = 10 mg
Exception: analytical balances (readout [d] ≤ 0,1 mg): E1 test weights are recommended. Depending on the safety requirements, E2 test weights with a DAkkS calibration certificate will also be sufficient.
The key points from the OIML norm R111:2004 OIML (Organisation Internationale de Métrologie Légale) has established the exact metrological requirements for weights in verified applications in approx. 100 states all over the world. The OIML recommendation R111 (2004 Edition) for weights relates to sizes 1 mg – 5000 kg. Statements are made on the accuracy, materials, geometric shape, marking and storage of the weights.
The error limit classes are in fixed hierarchical levels in the proportion of 1:3, where E1 is the most accurate and M3 is the least accurate weight class. When testing weights with other weights, the correct test class is the next highest class.
Error limit classes (= tolerances)
The values given in the table below (tolerances ± ... mg) are the respective permitted fabrication tolerances. They are to be equal to the measuring uncertainty of the weight, if no DAkkS calibration certificate is available.
The problem is the air buoyancy, which makes the weight appear lighter. In order to avoid this “distortion” in daily use, all weights are adjusted to the unit specifications as given in R111, e.g. it is accepted that: material density of the weights is 8000 kg/m3, air density is 1.2 kg/m3 and measuring temperature is 20 °C.
Our test weights: Unless otherwise specified, they conform to OIML R111:2004 in every detail.
and much more
Sets of test weights in case
Single test weights
Standardised weight containers for testing high-load floor scales, pallet scales, pallet truck scales, crane scales, etc. This can also be used for storing the weights. This means the weight container and the weights can be placed on the balance in one go, saving you time and money. The weight container is calibrated to OIML accuracy class M1
Milligram weights
Hook weights, finely turned brass
Slotted weights, finely turned brass
Beam bars for slotted weights, aluminium or finely turned stainless steel
Rectangular weights, cast iron, lacquered or finely turned stainless steel
Wooden Box for Single Weights and Sets
Crafted with precision and elegance, this wooden box offers a timeless solution for storing single weights or complete weight sets. Made from high-quality wood, it features a smooth finish and durable construction to ensure your weights are protected and displayed beautifully. Perfect for professionals and hobbyists, the box includes a secure clasp and a padded interior for added safety.
Plastic Case for Single Weights and Sets
Lightweight, durable, and convenient, this plastic case is ideal for transporting and storing single weights or sets. Designed with practicality in mind, it features a sturdy exterior and a shock-resistant interior to keep your weights secure during travel or storage. The ergonomic handle and snap-lock closure provide added convenience for users on the go.
Aluminium Protected Case for Single Weights and Sets
For the ultimate in protection and style, this aluminium case is engineered to safeguard your weights with a sleek, robust design. It features a reinforced frame, foam-lined compartments, and a lockable latch system to ensure maximum security. Ideal for professionals, laboratories, and precision enthusiasts, this case combines functionality and sophistication for weight storage and transport.
Let me know if you need any further refinements!
Accessories for calibration weights
Included documents
Wooden box for individual weights (Cylindrical/compact, 1 g)
Case suitable for nominal weight values | 1 g |
Case suitable for OIML classes | E1+E2+F1 |
Suitable weight shape for case | Cylindrical/compact |
Dimension (W×D×H) | 60×60×45 mm |
Material | beech |
KERN Set of milligram weights, E1, 1 mg - 500 mg, Wire, stainless steel polished, in plastic case
Weight OIML class | E1 |
Shape weight | Wire |
Number of weights | 12 |
Material | stainless steel polished |
Test weight - nominal value | 1 mg - 500 mg |
Case of weight set | in plastic case |
Dimension (W×D×H) | 136×53×22 mm |
E1 - M2 Aluminium protective box for calibration weights 1 g
Case suitable for nominal weight values | 1 g |
Case suitable for OIML classes | E1 - M2 |
Suitable weight shape for case | Cylindrical/compact |
Dimension (W×D×H) | 70×77×73 mm |
Material | aluminium |
Set of milligram weights, E2, 1 mg - 500 mg, Platelet, stainless steel polished, in plastic case
Weight OIML class | E2 |
Shape weight | Platelet |
Number of weights | 13 |
Material | stainless steel polished |
Test weight - nominal value | 1 mg - 500 mg |
Case of weight set | in plastic case |
Dimension (W×D×H) | 136×53×22 mm |
Calibration weights Set 1mg - 50g
Included documents
Forceps to be able to safely grip small calibration weights Material: Stainless steel with silicone-coated tips Length: 105 mm
Forceps to be able to safely grip small calibration weights Material: Stainless steel with silicone-coated tips Length: 250 mm
Tweezers to be able to safely grip small calibration weights
Material: polyamide
Length: 100 mm
Suitable for weights with wight values 1 mg – 200 g of classes E1 – M3
Help to protect the test Dusting brush to clean the weights weights when being used daily, from grease from fingers, damp etc.. Ideal for test weights up to 2 kg
Help to protect the test Dusting brush to clean the weights weights when being used daily, from grease from fingers, damp etc.. Ideal for test weights from 2 kg
3 pairs
Calibration weight OIML Class E2 adjusting for calibration of the scales and balances
Included documents