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
Rice Lake Weighing System Weight, 2kg ASTM Class 7
Calibration Weight, Rice Lake Weighing Systems, 2kg, Grip Handle, ASTM Class 7, Cast Iron Painted, Density 7.2
Rice Lake Weighing System Weight, 2lb ASTM Class 5
Calibration Weight, Rice Lake Weighing Systems, Cylindrical, 2lb, ASTM Class 5, Stainless Steel, Satin finish, Density 7.84
Rice Lake Weighing System Weight Set,100g-1g ASTM Class 1 SST Polished (5321) with NVLAP Accredited NIST Traceable Calibration Report
100 g Range, Calibration Weight Set, ASTM Class 1Stainless steel polished finishDesigned to meet ASTM E617-23 specificationsASTM Class 0 weight sets and individual weights are not individually marked with their weight value or individually serialized per ASTM E617-23Nominal value marked on weightsSerial numbers applied to case (weights may be marked with symbol)Density 7.95g/cm3
Thomas Scientific Calibration Weight, F1 Grade, 200g
Accuris™ Instruments offers a range of precision calibration weights that are ideal for calibration of your Accuris lab balances. Each weight meets class F1 tolerance per OIML (International Organization of Legal Metrology) Recommendation R111. Made of highly polished, non-magnetic stainless steel, each calibration weight comes in a protective plastic case. The W1000 series of individual weights come in protective plastic cases with a screw top cover. The W1100-200 Weight Set includes 23 weights ranging from 1mg to 200g and is packaged in a protective carrying case with a set of tweezers, a dust brush and cleaning cloth. Special tweezers, with non-scratching plastic points are also available for proper handling; precision weights should not be touched with bare hands as oils and salts from the skin can stick to the surface of the weights. Class E2 Weight Set Premium Class E2 Weight Set is ideal for calibration of analytical balances with a 0.0001g readability. Precisio
Uline Stainless Steel Weight With Nist Traceable Certificate - Class 5, 5 Lb
Stainless Steel Weight With Nist Traceable Certificate-Class 5 5 Lb
