Calibration Weights
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
Fisherbrand™ Individual Stainless Steel Cylindrical Calibration Weights, Class F1 with certificate
Calibrate masses of class II and III weighing instruments. Fisherbrand™ Class F1 Individual Stainless Steel Cylindrical Calibration Weights are intended for use in the verification or calibration of class F2 weights and for use with weighing instruments of special accuracy.
Fisherbrand™ Individual Stainless Steel Cylindrical Calibration Weights, Class F1
Calibrate masses of class II and III weighing instruments. Fisherbrand™ Class F1 Stainless Steel Cylindrical Calibration Weights are intended for use in the verification or calibration of class F2 weights and for use with weighing instruments of special accuracy.
Fisherbrand™ Individual Stainless Steel Cylindrical Calibration Weights, Class M1
Use with weighing instruments of medium accuracy class III. Fisherbrand™ Class M1 Stainless Steel Calibration Weights are ideal for the verification or calibration of class M2 weights.
Zwiebel™ Pesi di classe M1 con scatola
Use with weighing instruments of medium accuracy class III. Zwiebel™ Class M1 Box Weights are ideal for the verification or calibration of class M₂ weights.
Fisherbrand™ Individual Stainless Steel Cylindrical Calibration Weights, Class E2 with Certificate
Calibrate weights of lower accuracy classes. Fisherbrand™ Class E2 Individual Stainless Steel Cylindrical Calibration Weights are intended for use in the verification or calibration of class F1 weights and for use with weighing instruments of special accuracy class I.
Fisherbrand™ Individual Stainless Steel Cylindrical Calibration Weights, Class F2 with certificate
Use with weighing instruments of high accuracy class II. Fisherbrand™ Class F2 Stainless Steel Calibration Weights are also intended for use in important commercial transactions, such as those involving precious metals and stones.
Ohaus™ Stainless Steel Calibration Weights - OIML E2, NVLAP
Supplied with a NVLAP Accredited Certificate and Adjusted to Meet or Exceed OIML E2 Tolerances
Sartorius™ OIML Class F2 Proof Line Knob Weight with DAkkS Certificate
Polished non-magnetizable calibration weights. Sartorius™ OIML Class F2 Proof Line Knob Weight with DAkkS Certificate is constructed of special steel and supplied in a plastic case.
Sartorius Weight Set
Weight Set features highly corrosion-resistant, knob weights that are highly polished and include a case.
Sartorius Wire Weight
The Wire Weight is made from special steel that is non-magnetizable, highly corrosion-resistant and comes in wooden case.
Ohaus™ Stainless Steel Calibration Weights - OIML F1, NVLAP
Supplied with a NVLAP Accredited Certificate and Adjusted to Meet or Exceed OIML F1 Tolerances
Sartorius Cylindrical Weight
Individual Cylindrical Weights are made from special steel that is highly polished, non-magnetizable, and highly corrosion-resistant.
Zwiebel™ Class F1 Calibration Weights
Zwiebel™ Class F1 Calibration Weights are intended for use in the verification or calibration of class F2 weights.
Zwiebel™ Peso di classe E2 con certificato di calibrazione COFRAC
Calibrate weights of lower accuracy classes. Zwiebel™ Class E2 Individual Stainless Steel Leaf Calibration Weights are intended for use in the verification or calibration of class F1 weights and for use with weighing instruments of special accuracy class I.