1. How often do I need to calibrate my balance and scale?

The frquency of calibration depends on how the device is used, the process tolerances applied, and the criticality of the weighing results. Our GWP® Verification service gives you concrete guidance for a customized calibration plan that meets the requirements of your process and weighing devices. 

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2. What is measurement uncertainty of a balance or scale?

Like all measurement devices, balances and scales have an inherent measurement uncertainty. This is where calibration comes in. It quantifies how accurate your weighing results really are by determining the measurement uncertainty. This gives you a plus/minus range for each of your weighing results.

Find out more in our video about calibration
Learn more with the white paper "Calibration of Weighing Instruments"


3. What is the safe weighing range? How does it help with accurate weighing?

The safe weighing range
The safe weighing range

The safe weighing range is the range in which the balance or scale gives the most accurate results. This range lies between a scientifically determined lower accuracy  limit (minimum weight determined through calibration) to which a safety margin is added (defined by the selected safety factor) and the maximum limit (capacity) of a balance or scale.

Process quality requirements are met if the smallest net weight lies within the safe weighing range.

Since most manufacturers do not declare the lower limits for their devices, it's important to define your tolerances to assure accurate results. 

4. How can I ensure accuracy between calibrations?

Over time, the performance of your balance or scale can change due to environmental incluences, wear and tear, and non-obvious damage. With routine testing performed by the user, you can check if the weighing device performs accurately enough to meet your needs until the next calibration.

Find out more about routine testing

5. Are the different calibrations available for different types of balances and scales? For instance, does METTLER TOLEDO offer an analytical balance calibration, a precision balance calibration and an industrial scale calibration?

Our Accuracy Calibration Certificate (ACC) works on all balances and scales, whether they are analytical balances, precision balances, production or truck scales. Therefore you get one calibration solution that is applicable for all your weighing devices.