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™ Analytical Individual Weights: ASTM™ Class 1
Low magnetic permeability and high corrosion resistance for reliable stable values
Mettler Toledo™ Analytical Individual Weights: ASTM™ Class 2
Low magnetic permeability and high corrosion resistance for reliable stable values
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.
OHAUS™ ASTM CLASS 4 WEIGHTS
Adjusted to Meet or Exceed ASTM Class 4 Tolerances
Sartorius ASTM Class Weight Set
ASTM Class Weight Set features calibration weights which can be used with all balance manufacturers' makes and models. Everything you need in one convenient case.
Mettler Toledo™ Analytical Individual Weights: ASTM™ Class 3, With Calibration Certificate
Low magnetic permeability and high corrosion resistance for reliable stable values. Supplied with a calibration certificate.
Troemner™ Metric Economical Stainless Steel Calibration Weight Sets, Class 7
Economical, quality weights
Troemner™ Individual Analytical Precision Weights, Class 1 with Traceable Certificate
Designed for your most demanding weighing applications
Troemner™ Individual Analytical Precision Weights, Class 1 with NVLAP Certificate
Low magnetic susceptibility, uniform consistency and high resistance to corrosion
Mettler Toledo™ ASTM Weight Set
Class 1, calibrated weights ranging from 1 mg to 200 g
Mettler Toledo™ F1AC Basic Weight Sets
Made of vacuum melted steel for highest material purity
Mettler Toledo™ Analytical Individual Weights: ASTM™ Class 4
Low magnetic permeability and high corrosion resistance for reliable stable values
Mettler Toledo™ CarePacs™
For routine testing of 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.