Frequently asked questions about industrial weighing equipment

Is readability and accuracy the same thing?

No. Readability is about legibility – the smallest quantity that a reading will display. It’s accuracy that really counts. This is the maximum difference between the applied test weight, and the displayed weight. When you’re short-listing equipment, remember that no device is 100% accurate. Typically, in a stable environment, accuracy is approximately +/- (2 x division size) throughout the weighing range.

Is calibration important?

Very. A valid calibration certificate provides clear evidence that weighing equipment has been checked and has been found to be within agreed tolerances.  During calibration, weighing equipment is compared against calibrated test weights, so the final readings are wholly accurate. A calibration certificate provides documentary evidence of traceability to national standards.  But the most important thing is that it demonstrates that your scales will continue to provide accurate, meaningful and legal measurements.

Some equipment should be calibrated annually, even monthly but that doesn’t mean you should forfeit the need for scales involved in critical processes and operations, to be checked daily.

Do you need to buy legal for trade scales?

If your business is buying or selling by weight, then you do. There are different classes of approval, depending on your industry, so we suggest you check with your supplier which one is relevant for you.  Note that only certain scales can be trade approved.

Stainless v aluminium?

Scales are impacted by the environment they are used in, and that ultimately determines which material is right. Aluminium is light, durable and inexpensive, whereas stainless scales are more suited to environments where they are susceptible to moisture, corrosive or abusive contamination. Stainless scales are tough, robust and can deal with harsh environments.

Can environmental factors interfere with accuracy?

Absolutely. Things like dust, changes in temperature, drafts, even static electricity can alter your readings. That’s why it’s important to carry out maintenance and inspection on your equipment, and to have scales calibrated on a regular basis.