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
Mettler Toledo™ M1 OIML Class Standard Weight (M1 PL E)
Single M1 OIML weight constructed of 304 stainless steel and housed in a plastic box.
Mettler Toledo™ E2 OIML Class Standard Weight Set (E2 AL)
E2 OIML class weight set is housed in an aluminum box and includes accessories for handling and cleaning.
Mettler Toledo™ F1AC Basic Weight Sets with Certificates
Made of vacuum melted steel for highest material purity
Mettler Toledo™ F1 OIML Class Standard Weight Set (F1 AL C)
F1 OIML class weight set housed in an aluminum box includes accessories for handling and cleaning, and a calibration certificate.
Mettler Toledo™ F2AC Basic Weight Sets with Certificate
Made of vacuum melted steel for highest material purity
Mettler Toledo™ F2AC Basic Cylindrical Knob Weights with Certificate
Individual weights
Mettler Toledo™ E2 Premium Wire Weights with Certificate
Individual weights
Mettler Toledo™ M1 OIML Class Advanced Weight Set (M1 PL C E)
M1 OIML quality weight set housed in a plastic case includes accessories for handling and cleaning, and a calibration certificate.
Mettler Toledo™ F2 Adjusting Cavity
Basic Line Weights - Design with adjusting cavity allows cost and time saving production processes. These favorably priced weights are perfect for routine testing. High quality, stainless steel for all weights offers longer life-span.
Mettler Toledo™ F2 OIML Class Advanced Weight (F2 PL C E)
Single F2 OIML weight includes a calibration certificate and is housed in a plastic box.
Mettler Toledo™ Analytical Individual Weights: ASTM™ Class 2
Low magnetic permeability and high corrosion resistance for reliable stable values
Mettler Toledo™ M1 OIML Class Standard Weight Set (M1 PL E)
M1 OIML class weight set includes accessories for handling and cleaning, and is housed in a plastic box.
Mettler Toledo™ F1 OIML Class Standard Weight Set (F1 PL C E)
F1 OIML quality weight set housed in a plastic case includes accessories for handling and cleaning, and a calibration certificate.
OHAUS CalPak Certified Calibration Weight Set, ASTM Class 1
ASTM Class 1 Certified Calibration Weight Set with an Accredited Certificate