Do you want to set up the weight calibration lab? You must then hire the best and reliable services that can set up the weight calibration accurately for your labs. The experts will set up the lab explicitly and keep the impact due to vibrations at bay. When calibrated correctly, it starts to work precisely. The calibration weight is critical in every lab as it helps to give precise readings in the laboratory. Not all weight calibrations are made in the same way. There is a class assigned to the calibration weights depending on the accuracy and weight tolerance. The different classes of weights include NIST, OIML, and ASTM. These are the three certificates that are given to give permissions to different weights.

Few of the weight calibration to look into are

Weight classes


National Institute of Standard and Technology class F weights would be widely used for the industrial purpose to validate different classes of weight such as Class III, Class IIII, and other non-designated scales. These are widely used in warehouses and manufacturing units to calibrate scales used or produce and ship different products. However, the NIST Class F weights are not used in laboratories as the weights are not precise to validate the scales that are used in various lab applications.


The American Society for testing and materials is an NGO that would come up with the consensus standards. There are ten different types of weight calibrations being developed. If the class number is high, the tolerance level would be high. The labs will use ASTM weight of class 4 or less. The ASTM weights are the widely used calibration weights across the laboratories that are set up in the US.


The International Organization of Legal Metrology would offer various standards and systems that help you achieve the goal of balancing the legal metrology procedures. The tolerance levels would be from lowest to highest, and there will be different OIML classes being used, such as E1, E2, F1, F2, M1, M2, and M3. The labs would use OIML weighs of class F2 or less. The class weights of this type are widely used in the laboratories in the US.

Certification weights

Different certifications are given to the calibration weights. Based on the application, you would use the calibration weights with certification to ensure that the weights are accredited.

ISO/IEC 17025

International Organization for Standardization is a standalone NGO that has 164 standard bodies. IEC is an international standard organization that is exclusively used for the electro technical fields. These two organizations have created the ISO/IEC 17025 standards. It is the international standards that must be used by the laboratories that are testing and calibrating the weights to produce reliable results.


NVLAP is the calibration program made by the National Voluntary Laboratory Accreditation Program (NVLAP) with NIST’s help. It will help the calibration labs to check the competency and accreditation in diverse fields. When accrediting the calibration laboratories, it ensures that the labs meet the ISO/IEC 17025 standards.


There is a myriad of calibration weight styles available in the market. However, not every style can be used for all applications. Few of the widely set up calibration weight styles in the laboratories include

Cylindrical: The weights will be cylindrical. The ridge that is present on the top will let you handle them with ease.

Grip handle: The grip handle present on the cylindrical weight would make it easier to handle heavyweights.

Pipe handle: The pipe handle allows you to move heavier weights with ease.

Knob: There is a knob equipped to the top’s weight, which makes it pretty easier for you to lift the weight with hands or use the forceps.

Hook: This type of weight style is widely used to measure torque, pressure, and tensile strength.

Slotted: The disk shape of the weighted style will let you adjust the load or force. You can use it as a standalone or hang it to the hanger.

Leaf: The thin and lightweight metal tabs that have low denominations. When there is a fold on the tab, it becomes easier to lift the weight with the help of forceps.


There are different types of materials that are used in making the calibration weight. It depends on the usage and weight. The weights would be made using stainless steel and aluminum. The less accurate weights that are heavy are made using cast iron, and these are coated in silver or gold.

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