When it comes to weighing scale operations, calibration is one of the most important steps in assuring that your scales give accurate measurements.
Calibration weights, also called as test weights, are used to test a scale’s accuracy and adjust them to make sure that your weighing scales are functional for the longest time possible. The process of adjusting, known as calibrating a scale, lets the user know if a scale is working accurately or not.
If you have been getting inaccurate readings with your electronic weigh scale, calibrating the scale will tell you if the issue can be fixed or if the scale needs to be replaced.
So, now you know that test weights are essential equipment for all weighing operations. But one key thing to keep in mind is that not all calibration weights are suitable for all types of scales.
There are certain guidelines that need to be followed in the calibrating process. Below, we discuss some of the important considerations to keep in mind before you purchase any new test weights.

Weight Classes
Weighing scale manufacturers offer test weights in different classes, as follows: M1, M2, M3, E1, E2, F1, F2, and E0. Each different weight class is suitable for scales with different load capacities.
For example, E2 class test weights are ideal for calibrating analytical balances, but a standard scale for heavier loads would need M1 class weights.
While selecting a calibration weight, make sure you choose a weight compatible with the weighing scale you have. Otherwise, it may not produce accurate results.
Materials
Test weights are made of different materials such as aluminium, stainless steel, cast iron, tungsten, and so on.
The type of material used determines the density of the test weight, and hence, should be chosen carefully. Before purchasing, one must also pay attention to the durability, non-corrosive features, and anti-magnetism of the test weight.
The weight classes of F1, E1, and E2are typically used for high-precision balances and thus, should be handled very carefully.
Shapes
Test weights come in various shapes and sizes. This includes cylindrical, grip handle, and leaf-style weights. Choose a suitable test weight based on the type of electronic weigh scale you have.
Cylindrical test weights are the most commonly used and applicable for standard weigh scales measuring a load between 5kg to 10lb. Grip handle weights are best for scales of high-load capacity, while leaf design weights are ideal for precision balances.
OIML and ASTM Certified Weights
To ensure the complete efficiency and accuracy of your weighing scales, only choose OIML and ASTM certified calibration weights. These weights are robust and strong, and come with an assurance of durability, quality, and efficiency.
Final Words
Calibration of a weighing scale is an important ritual that needs to be done periodically to ensure the accuracy and efficiency of the scale. The next time you need to buy any calibration weights, keep the above-discussed points in mind.
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