Calibration Weights
Accurate and stable reference standards for calibrating weighing equipment, including variously certified/accredited weights and weight sets from different classes. Products may be constructed of aluminum, stainless steel, brass, iron, and other alloys.
Calibration weights (also known as reference weights or test weights) are manufactured to meet high tolerances and accuracy. They are used to spot-check the performance and verify the calibration of analytical balances, precision balances, and general-purpose scales in research laboratories, educational settings, and other working environments. Some calibration weights may also be used as reference weights for the calibration of improvised or non-certified weights.
How Are Calibration Weights Made?
Calibration weights may be take the form of simple discs, cylinders, wires, or leaves. Sold separately or as sets, they may also be supplied with tweezers, gloves, and a protective case. Calibration weights are often supplied as accessories for specific balance brands and models.
Calibration weights are made from polished brass, aluminum, special stainless steels, or other metals for durability, anti-magnetization, and resistance to corrosion or wear that may affect their accuracy.
Available in nominal values from a few milligrams to 10 kg or more, they may be supplied with certificates or statements of accuracy, compliance, and traceability.
How Are Calibration Weights Classified?
Calibration weights are classified based on accuracy by organizations such as ASTM, OIML, and NIST. The appropriate classification depends on the resolution of the balance and the degree of accuracy needed to satisfy a particular weighing application.
Principal Classes of Calibration Weights:
• Class M1: For standard scales
• Class F1: For precision electronic balances
• Class E2: For highly accurate analytical balances
Ohaus™ Stainless Steel Calibration Weight
Adjusted to meet or exceed OIML M1 tolerances
Ohaus™ Stainless Steel Calibration Weight Weight - OIML E1 Wire
Adjusted to Meet or Exceed OIML E1 Tolerances
Ohaus™ OIML F1 Weight Set
Adjusted to Meet or Exceed OIML F1 Tolerances
Ohaus™ OIML E2 Weight Set, NVLAP Certificate
Supplied with a NVLAP Accredited Certificate and Adjusted to Meet or Exceed OIML E2 Tolerances
Mettler Toledo™ CarePacs™
For routine testing of balances
OHAUS™ Triple Beam Balance Mass Set
For use with a variety of mechanical scales. OHAUS™ Triple Beam Balance Mass Set includes two 1kg and one 500g counterweights for use with compatible Triple Beam 700 series, Dial-O-Gram 1600 series and Pro series mechanical balances.
Ohaus™ OIML Class E2 Weights
OHAUS™ OIML Class E2 Weights are adjusted to meet or exceed OIML E2 Tolerances.
Sartorius™ OIML Class F1 Reference Line Weight Set with DAkkS Certificate
Includes the same features and properties as the individual weights of this series, along with the corresponding maximum permissible errors. Sartorius™ OIML Class F1 Reference Line Weight Set with DAkkS Certificate is supplied with gloves, tweezers and brush in high-quality plastic case
Sartorius™ Stainless Steel OIML Class F1 Service Weight Sets Without DAkkS Calibration Certificate
F1 weight set with high gloss polished finish
Sartorius™ External Adjusting Weight Without DKD Calibration Certificate
Test weight weight set for special weighing instruments
Sartorius™ Stainless Steel OIML Class F1 Reference Line Weight
Stainless Steel OIML Class F1 Reference Line Weight without DAkkS Calibration Certificate.
Sartorius™ Stainless Steel OIML Class F2 Calibration Weight Without DAkkS Calibration Certificate
Highly polished steel calibration weights from 100g to 10kg