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, 25lb ASTM Class 6
Calibration Weight, Rice Lake Weighing Systems, 25lb, Grip Handle, ASTM Class 6, Cast Iron, Painted
Rice Lake Weighing System Weight Set,5lb-0.001lb ASTM Class 5
Calibration Weight Kit, Rice Lake Weighing Systems, 5lb-.001lb, ASTM Class 5, Stainless Steel, Satin finish, 31.11lb Kit
Genscript Corporation CytoSinct M1 magnet
The CytoSinct Manual Separator system is developed to separate human and animal cells The material to be separated for example cells is first magnetically labeled with superparamagnetic CytoSinct Nanobeads After magnetic labeling cells are passed through a CytoSinct Columns which is placed in the strong permanent magnet of the CytoSinct Manual Separator The ferromagnetic spheres in the column amplify the magnetic field by 10 000-fold thus inducing a high Magnetic field gradient Unlabeled cells pass through while magnetically labeled cell are retained within the column After removal of the column from the magnetic field the retained fraction can be eluted Both fractions labeled and non-labeled can be collected for downstream applications including cell culture and flow cytometry
Grainger Dial Scale SS 50 lb Weight Cap. Silver
The Dial Scale SS-50 is a 50 lb capacity stainless steel mechanical dial scale with a 6 inch diameter dial face. It has a zero adjust knob and features a sturdy steel base with rubber feet. The scale weighs 5 lbs and measures 11 x 7 x 2 inches. It can be used for weighing items in industrial, commercial, or home settings. The scale is made in the USA by Dial Corporation, a leader in precision measurement instruments. It comes with a 5 year limited warranty.
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 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 supplier. The product dimensions are 4.5" diameter x 23.6" height and it weighs approximately 9 lbs when full.
Immunology Consultants CSFV E2 Protein - Recombinant
This recombinant Classical Swine Fever Virus (CSFV) E2 antigen is a high‑quality research reagent designed to support virology, immunology, and diagnostic assay development. The E2 glycoprotein is the major immunodominant structural protein of CSFV and plays a central role in generating neutralizing antibodies, making it essential for studies of viral immunity and vaccine response. Produced recombinantly and supplied at 0.1 mg, this purified protein provides consistent performance in ELISA, serological assay calibration, antigen detection workflows, and method development for IVD applications. Its defined composition and reliable lot‑to‑lot reproducibility enable accurate assay optimization and experimental standardization. Manufactured by Immunology Consultants, this CSFV E2 antigen is ideal for laboratories requiring a dependable, well‑characterized viral protein for research and diagnostic innovation.