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
Sartorius Individual Precise Calibration Weight
ASTM Class 1 Individual Precise Calibration Weight without Certificate.
Mettler Toledo™ F1AC Basic Sheet Weights with Certificate
Individual weights
Mettler Toledo™ Analytical Individual Weights: ASTM™ Class 4
Low magnetic permeability and high corrosion resistance for reliable stable values
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™ Standard Line Weight Set: 1mg-2kg E2 AL
Standard Line Weights. Specially used stainless steel, including the mg range, ensures anti corrosive surfaces with low magnetization and susceptibility values. Solid, one piece construction and mirror-polished surface grades give stable values.
Mettler Toledo™ ASTM Weight: 20kg, Class 1, with Plastic Case and Calib. Certificate
Mettler Toledo ASTM knob weights are designed to resist dust and moisture intrusion, offering a long term stability. High gloss polish: experience, combined with special skill acquired through years of weight polishing guarantee the consistent high quality for all customer demands.
Mettler Toledo™ Analytical Weight Sets: ASTM™ Class 4
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™ F1AC Basic Sheet Weights
Allows for optimized manufacturing and adjustment processes
Mettler Toledo™ CarePac™ Small Weights with Certificate
Higher process safety for more efficient testing
Mettler Toledo™ CarePacs™: Customized Third Weight
Third weight for customer-specific testing (e.g., minimum weight determination)
Mettler Toledo™ Analytical Individual Weights: ASTM™ Class 3
Low magnetic permeability and high corrosion resistance for reliable stable values. Calibration certificate not included.
OHAUS CalPak Certified Calibration Weight Set, ASTM Class 1
ASTM Class 1 Certified Calibration Weight Set with an Accredited Certificate
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.
