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
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.
Ohaus™ OIML E2 Weight Set, NVLAP Certificate
Supplied with a NVLAP Accredited Certificate and Adjusted to Meet or Exceed OIML E2 Tolerances
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 Leaf Calibration Weights, Class E2
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.
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™ Class F1 Precision Weights
Class F1 weight in a carry case
Fisherbrand™ Stainless Steel Cylindrical Calibration Weight Set, Class E2
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™ Special Steel Certified E2 Wire Calibration Weight
Ensure precise calibration and comparative measurements. Fisherbrand™ Special Steel Certified E2 Wire Calibration Weight is a highly accurate individual weight with a nominal mass of 5mg. The wire weight conforms to class E2 requirements and isISO 17025 certified.
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Ohaus™ OIML M1 Weight Set, 1g-1kg
Adjusted to meet or exceed OIML M1 tolerances. Ohaus™ OIML M1 Weight Set, 1g-1kg includes 15 weights with a mass ranging from 1g to 1 kg in a sturdy polycarbonate case.
Sartorius™ Proof Line Weight Set
Proof Line weights are high-quality working standards for everyday use, made of high-quality materials.
Ohaus™ Stainless Steel Calibration Weights - OIML F1
Adjusted to Meet or Exceed OIML F1 Tolerances
Sartorius Wire Weight
The Wire Weight is made from special steel that is non-magnetizable, highly corrosion-resistant and comes in wooden case.