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.
Ohaus™ Stainless Steel Calibration Weights - OIML E2, NVLAP
Supplied with a NVLAP Accredited Certificate and Adjusted to Meet or Exceed OIML E2 Tolerances
Sartorius™ Stainless Steel F1 Cylindrical Calibration Weight
Ensure accurate calibration and weighing. Fisherbrand™ Stainless Steel F1 Cylindrical Calibration Weight is a highly accurate individual weight with a nominal mass between 1g and 10kg. These cylindrical weights conform to class F1 requirements.
Fisherbrand™ Individual Stainless Steel Leaf Calibration Weights, Class E2 with certificate
Calibrate weights of lower accuracy classes. Fisherbrand™ 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.
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.
Sartorius Leaf Weight
Leaf Weight is available in aluminum or nickel silver and comes in a case for protection.
Sartorius™ OIML Class E2 Proof Line Knob Weight with DAkkS Certificate
Polished non-magnetizable calibration weights. Sartorius™ OIML Class E2 Proof Line Knob Weight with DAkkS Certificate is constructed of special steel and supplied in a plastic case.
Ohaus™ Stainless Steel Calibration Weights - OIML F1, NVLAP
Supplied with a NVLAP Accredited Certificate and Adjusted to Meet or Exceed OIML F1 Tolerances
Ohaus™ Stainless Steel Calibration Weights - OIML F1
Adjusted to Meet or Exceed OIML F1 Tolerances
Sartorius™ OIML Class M1 Weight Set without Certificate
Includes the same features and properties as the individual weights of this series, along with the corresponding maximum permissible errors. Sartorius™ OIML Class M1 Weight Set without Certificate is supplied with gloves, tweezers and brush in a high-quality plastic case
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.
Zwiebel™ Precision E2 Weight
Boxed weight
Zwiebel™ Class M1 Box Weights
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.