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
Cayman Chemical E2 2Chlorostyryl3 5 6 10mg
A stilbene derivative with antioxidant and anticancer activities; stimulates proliferation of hydrogen peroxide-damaged ECV-304 cells (EC50 = 24.9 nM); reduces hydrogen peroxide-induced release of LDH in and increases viability of HUVECs; reverses hydrogen peroxide-induced release of MDA and decreases in SOD and GSH-Px activities and increases cNOS activity and NO production in HUVECs; induces cell death of A549 NSCLC cells in an IRE1α-dependent manner
Reprocell Stemolecule™ Y27632 2mg
Y27632 is a cell-permeable small molecule Rho-associated kinase (ROCK) inhibitor. Size 2 mg. Y27632 has been found to prevent apoptosis as well as enhance the survival and cloning efficiency of dissociated human embryonic stem (ES) cells without affecting their self-renewal properties or pluripotency. This molecule has also been shown to enhance survival during the transplantation of ES cell-derived neural precursors. Y27632 in combination with Pifithrin-u significantly improves cell recovery after cryopreservation.
TARGETMOL CHEMICALS INC PROSTAGLANDIN E2 25MG
Also available in 1 mg 2 mg 5 mg 10 mg 50 mg 100 mg 500 mg 1000 mg 1 mL 10 mM (in DMSO) and bulk. Please contact Fisher for quotes. Prostaglandin E2 (PGE2) is a hormone-like compound involved in various physiological processes including smooth muscle contraction and relaxation modulation of blood vessel dilation and constriction regulation of blood pressure and inflammation modulation. purity: 99%
Electron Microscopy Sciences Green-Lite™ Light with Rectangular LED 7"x5 ¼", 2x, Weighted Base
Equipped with next generation, surface mount LEDs, these innovative illuminated magnifiers will quickly pays for themseves through energy savings.
Made in the USA they feature the highest lumen output in a lighted magnifier and reduced glare, heat, and energy consumption. User controlled LED groups shine desired level of light exactly where required, and superb dimming software via convenient, reliable membrane switch.
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Type: Weighted Base
Uline Stainless Steel Weight With Nist Traceable Certificate - Class 5, 5 Lb
Stainless Steel Weight With Nist Traceable Certificate-Class 5 5 Lb
