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
Rice Lake Weighing System WEIGHT 2G OIML CLASS F2
Calibration Weight Kit, Rice Lake Weighing Systems, 2g, OIML Class F2
Rice Lake Weighing System WEIGHT KIT 1LB ADJUSTED ASTM
Calibration Weight Kit, Rice Lake Weighing Systems, 1lb, Adjusted, ASTM Class 1, SST Polished, Density 7.84, Electronic Balance Calibration Weights
Rice Lake Weighing System WEIGHT KIT 2KG ASTM CLASS 2
Calibration Weight Kit, Rice Lake Weighing Systems, 2kg, ASTM Class 2, SST Satin, Density 7.84, Electronic Balance Calibration Weights
Rice Lake Weighing System WEIGHT SCREW KNOB 1G ASTM
Calibration Weight, Rice Lake Weighing Systems, Screw Knob, 1g, ASTM, Class 1, SST, Polished Density 7.95
Rice Lake Weighing System WEIGHT 10LB CAST IRON ASTM
Calibration Weight, Rice Lake Weighing Systems, 10lb, Grip Handle, ASTM Class 7, Cast Iron, Painted
Rice Lake Weighing System WEIGHT KIT 1MG ASTM CLASS 0
Calibration Weight Kit, Rice Lake Weighing Systems, 1mg, ASTM Class 0, Density 2.7
Rice Lake Weighing System Weight, 2mg ASTM Class 5
Calibration Weight, Rice Lake Weighing Systems, Leaf Style, 2mg, ASTM Class 5, Stainless Steel, Satin finish, Density 7.95
Rice Lake Weighing System Weight, 2g ASTM Class 5
Calibration Weight, Rice Lake Weighing Systems, Cylindrical, 2g, ASTM Class 5, Stainless Steel, Satin finish, Density 7.84
Grainger Calibration Gas 116L Ethylene 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 air from a reliable gas supplier. The 16N087 model contains the air calibration gas in a medium size cylinder for portability.
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.