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
Bio X Cell InVivoMAb anti-mouse/human CD11b (clone M1/70), 50 mg
InVivoMAb anti-mouse/human CD11b (clone M1/70) is a rat IgG2b monoclonal antibody formulated for in vivo CD11b neutralization, cell purification, and flow cytometry. Supplied in PBS (pH 7.0) with low endotoxin and no stabilizers or preservatives, the product is available in multiple sizes including a 50 mg vial.
- Clone: M1/70.
- Target antigen: CD11b (integrin alpha M).
- Host and isotype: Rat IgG2b, kappa.
- Species reactivity: Mouse and human.
- Formulation: PBS, pH 7.0.
- Endotoxin: ≤1 EU/mg.
- Preservative: none.
- Applications: in vivo neutralization, cell purification, flow cytometry.
- Available sizes: 1 mg, 5 mg, 25 mg, 50 mg, 100 mg.
Rice Lake Weighing System Weight, 50lb ASTM Class 6 Traceable
Calibration Weight, Rice Lake Weighing Systems, 50lb, Grip Handle, ASTM Class 5, Cast Iron, Painted with Traceable Certificate
Essendant Survivor Lightweight 14 lb Tyvek Catalog Mailers, #6 1/2, Square Flap, Redi-Strip Adhesive Closure, 6 x 9, White, 100/Box
Quality Park Survivor Catalog Mailers are made with durable 14-lb DuPont Tyvek which is strong enough to withstand the most grueling conditions The material is puncture tear and moisture resistant virtually indestructible Yet it is still lightweight which can provide a savings on shipping costs These white mailing envelopes feature an easy Flap-Stik closure which requires no moisture for a secure seal and a release strip for quick easy opening Lightweight 14 lb Tyvek Seam Type- Center Flap Type- Square Trade Size- 6 1/2 Security Tinted- No
Teledyne ISCO, Inc Hk, M1, .250, Stainless Steel, 1A, Double
HK, M1, .250, STAINLESS STEEL, 1A, DOUBLE
Sigma Aldrich Fine Chemicals Biosciences Economical neoprene dry-bo
Neoprene bonded sleeve and glove.General purpose elastomer. Resists moderate chemicals and acids ozone oils fats greases many oils and solvents. Attacked by strong oxidizing acids esters ketones chlorinated aromatic and nitro hydrocarbons.
Rice Lake Weighing System WEIGHT KIT 5KG ADJUSTED ASTM
Calibration Weight Kit, Rice Lake Weighing Systems, 5kg, Adjusted, ASTM Class 1, SST Polished, Density 7.84, Electronic Balance Calibration Weights
Rice Lake Weighing System WEIGHT KIT 4KG ASTM CLASS 4
Calibration Weight Kit, Rice Lake Weighing Systems, 4kg, ASTM Class 4, SST Satin, Density 7.84, Electronic Balance Calibration Weights