Certified calibration weights are essential tools used to ensure the precision of your digital scale. Whether you need a Statement of Accuracy, Traceable Weight Certificate, or a NVLAP Weight Certificate, at Digital Scales AZ you'll find the certified calibration weights required to calibrate your digital scales.
If your weighing applications require the highest precision from your digital scale, using certified calibration weights is the only way to ensure precise calibration. All of the certified calibration weights that you'll find in this category have been certified to meet the requirements set by either the NIST or the ASTM. Whether you're looking to purchase certified weights as a complete set or individually, with or without certificates, there are a few terms you'll need to know.
NIST (National Institute of Standards and Technology) is part of the United States Department of Commerce. This division is responsible for making the regulations that manufacturers must abide by in order to meet industry standards. NIST certified weights are guaranteed to meet their set standards and are most often used in legal for trade and commercial scales.
ASTM (American Society of Testing and Materials) is an international organization dedicated to establishing and developing better methods for testing materials. Calibration weights that are ASTM certified are manufactured as one piece without fillers for adjustment and meet the ASTM set requirements for finish, tolerance, and magnetism. These calibration weights are ideal for calibrating other weights and high-resolution scales.
Statement of Accuracy will accompany calibration weights that do not come with a certificate. This statement will include details about the weight such as date of calibration and weight density. The statement of accuracy also provides certification that the weight was manufactured to the specifications set for its class and was calibrated by standards that are traceable to NIST.
Traceable Weight Certificates are ideal for companies and laboratories that are not required to meet any strict regulatory regulations, but do require traceability. Unlike NVLAP certification, Traceable Weight Certificates process for measurement is based on one standard and use only one set of comparisons.
NVLAP (National Voluntary Laboratory Accreditation Program) is run by the NIST. Certifications from NVLAP are multi-page documents that include details certifying that these weights meet all ISO standards.
ASTM Class 1 calibration weights are used in calibrating high-precision scales with readabilities ranging from 0.01mg to 0.1mg.
ASTM Class 2 calibration weights are used in calibrating high-precision scales with readabilities ranging from 0.001g to 0.01g.
ASTM Class 3 calibration weights are used in calibrating precision scales with readabilities ranging from 0.01g to 0.1g.
ASTM Class 4 calibration weights are used in calibrating student use and semi-analytical scales.
NIST Class F calibration weights are the most precise weights we have to offer. These calibration weights can be found calibrating devises used by local and state weights and measures offices, by service technicians, and device installers. Class F weights can be used to test the accuracy of scales designated class III, class III L, class IIII, and other scales that are not marked with a class designation.