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
Uline Stainless Steel Weight With Nist Traceable Certificate - Class 5, 200 G
Stainless Steel Weight With Nist Traceable Certificate-Class 5 200 G
Uline Cast Iron Weight With Nist Traceable Certificate - Class 6, 25 Lb
Cast Iron Weight With Nist Traceable Certificate-Class 6 25 Lb
Electron Microscopy Sciences Class 10 Sticky Swabs assorted
Dust-free sticky swabs are specially used and designed for a high degree dust-free environment (class10-100). Anti-static treatment can safely dissipate electrostatic charge. Sticky swabs are applicable for manufacturing and assembling static sensitive products.
Hach Company Weight Set, Class M-2
Standard weight set. 16-piece, with stainless steel forceps. Eight fractional weights: 10, 20, 50, 100, 200, 200, 200, and 500 mg. (Two fractional weights, 200 mg and 500mg, are stainless steel, the rest are aluminum) Eight brass gram weighs: 1, 2, 2, 5, 10, 10, 20, and 50 grams. Polypropylene case.
Grainger Calibration Gas 116L Ammonia Air
The Portagreen Calibration Gas Air 30 is a calibration gas used to calibrate and bump test gas detectors. It contains 30% oxygen balance nitrogen and comes in a 34 liter cylinder with CGA 590 outlet connection. The gas has a 2 year recommended shelf life and is available in high pressure cylinder sizes of 34L, 58L, 103L, and 116L. This calibration gas meets ISO 6141 standards and is suitable for calibrating and bump testing many brands of portable gas detectors.
Grainger Calibration Gas 116L Carbon Dioxide Air
The GASCO Calibration Gas - Air is a calibration gas cylinder containing air for calibrating gas detection instruments. This 34 liter aluminum cylinder contains 99.9995% pure air balanced with nitrogen and is certified to NIST traceable standards. The cylinder has a CGA-590 outlet with a brass valve and is refillable. This calibration gas is suitable for calibrating and bump testing gas detectors used for monitoring oxygen levels. With a 2 year shelf life, this cylinder from GASCO provides high purity calibration air for maintaining and calibrating gas detection systems.
Grainger Calibration Gas 116L Ammonia Air
The GASCO Calibration Gas - Air is a calibration gas cylinder containing air for calibrating gas detection instruments. This 34 liter aluminum cylinder contains 99.9995% pure air balanced with nitrogen. It has a working pressure of 1800 psi and comes with a CGA-590 outlet connection that is compatible with many gas detection instruments. The cylinder should be stored and used in accordance with local regulations. This calibration gas is useful for verifying calibration on gas detectors used for oxygen deficiency monitoring.