What do the OIML classes mean, which weight suits your scale and how do you keep weights accurate? In these articles we share the knowledge from our calibration laboratory. To have your weights calibrated, read more about weight calibration.
If a weight falls outside its class, it can often be adjusted. This is how it works for knob, block and solid weights, and these are the alternatives when adjustment is not possible.
Read article →Cast iron, stainless steel or chrome-plated brass: the material of a weight determines which classes are possible, how much maintenance it needs and what it is suitable for.
Read article →Every calibration certificate for weights states the conventional mass. What that convention means, why the air counts and when it makes a difference in practice.
Read article →No standard prescribes how often weights must be calibrated. This is how you determine a well-founded calibration interval yourself and recognise the signals to calibrate earlier.
Read article →What does the measurement uncertainty on your weight certificate mean? An explanation of k=2, the one-third mpe requirement, the in-tolerance assessment and correction values.
Read article →The seven OIML R111 classes determine how much a weight may deviate. Read what each class means, what you use it for and find the complete tolerance table.
Read article →Most deviations in weights arise between two calibrations. Practical tips on storage, handling, cleaning and transport, by material and class.
Read article →Test weight, check weight, calibration weight and mass standard are used interchangeably. We explain where the words come from and what you really look at: class and certificate.
Read article →Working with weights from 20 kg to 2,000 kg requires planning and the right equipment. Practical points for lifting, transport, storage and maintenance, and the choice between buying and hiring.
Read article →The right calibration weight depends on the error your scale is allowed to make. With the calculation rule from OIML R76, practical examples and our selection tool you find the right class.
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