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
Grainger Calibration Gas 116L Carbon Monoxide Air
The GASCO Calibration Gas - Air is a calibration gas cylinder containing air for calibrating gas detection instruments. It has a capacity of 103L and contains 20.9% oxygen with the balance being nitrogen. The cylinder has a CGA-590 outlet connection and comes in an aluminum cylinder. The product has a 2 year recommended shelf life and is manufactured in the USA. It can be used for calibrating and bump testing gas detectors to ensure proper operation and measurement. The cylinder is DOT approved for shipment.
Grainger Calibration Gas 116L Carbon Monoxide Air
The GASCO Calibration Gas - Air is a calibration gas cylinder containing air for calibrating gas detection instruments. This 16 liter aluminum cylinder contains 99.9% 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 detectors. The cylinder should be stored and used in accordance with local regulations. This calibration gas is useful for ensuring accurate readings when using gas detection equipment.
Leica Biosystems Leaf spring - replacement for Leica microtome (compatible with RM2145)
Leaf Spring (MPN 14050229557) is a replacement service part from Leica Biosystems used in microtome cutting assemblies to restore correct tension and maintain sectioning performance during repairs and routine maintenance.
- Restores correct tension in the cutting assembly.
- Helps maintain consistent sectioning performance.
- Intended for service and repair use.
- Designed for straightforward replacement following service instructions.
Cayman Chemical ProstaglndIn E2 10mg
PGE2 is one of the primary COX products of arachidonic acid and one of the most widely investigated PGs. Its activity influences inflammation, fertility and parturition, gastric mucosal integrity, and immune modulation.{1585,1558,437,1330} The effects of PGE2 are transduced by at least four distinct receptors designated EP1, EP2, EP3, and EP4.{1422} Affinity constants (Kd) of PGE2 for these receptors range from 1-10 nM depending on the receptor subtype and tissue.