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™ F1AC Basic Cylindrical Knob Weights with Certificate
Individual weights
Mettler Toledo™ E2 Premium Wire Weights
Individual weights
Mettler Toledo™ Analytical Weight Sets: ASTM™ Class 1
ASTM precision weights, Best Price-Performance Ratio. Low magnetic permeability and high corrosion resistance ensure reliable values. All weights are made with stainless steel.
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™ Analytical Weight Sets: ASTM™ Class 2
Square sheet and cylindrical weights.
Mettler Toledo™ CarePacs™
For routine testing of balances
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.
Mettler Toledo™ F2AC Basic Sheet Weights with Certificate
Individual weights
Mettler Toledo™ F1AC Basic Weight Sets
Made of vacuum melted steel for highest material purity
Mettler Toledo™ CarePac™ Small Weights with Certificate
Higher process safety for more efficient testing
Mettler Toledo™ F1 OIML Class Standard Weight Set (F1 AL)
F1 OIML class weight set includes accessories for handling and cleaning, and is housed in an aluminum box.
Mettler Toledo™ F2 OIML CarePac™ Weight
CarePac™ Small F2 weight set includes accessories for handling and cleaning, and a calibration certificate.
Mettler Toledo™ Analytical Individual Weights: ASTM Class 2, with Certificate
Low magnetic permeability and high corrosion resistance for reliable stable values
OHAUS™ ASTM CLASS 4 WEIGHTS
Adjusted to Meet or Exceed ASTM Class 4 Tolerances