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 KIT 1MG ASTM CLASS 0
Calibration Weight Kit, Rice Lake Weighing Systems, 1mg, ASTM Class 0, Density 2.7
Rice Lake Weighing System Weight Set,100g-1g ASTM Class 5 SST Satin (5221) 210g Kit
Weight Set,100g-1g ASTM Class 5 SST Satin (5221) 210g Kit
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
World Precision Instrument Analog Microforge-MF200-M1
The MF200 Microforge is a versatile instrument designed specifically for the fabrication of glass micropipettes and other related tools. The system was developed in collaboration with Dr. Ming Li of the Department of Pharmacology, University of South Alabama. The MF200 is simple, reliable and economically priced.
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
Grainger Screw Knob Black
The Justrite Screw Knob is a black plastic knob designed for use with Justrite safety cans. It has a 1-3/4" diameter knurled grip and a 1/4"-20 threaded stud. The knob can be used as a replacement part on many Justrite safety cans, including the 2 gallon and 5 gallon rectangular safety cans. It provides a comfortable grip and secure closure for the safety can pour spout. The black color matches most Justrite safety cans. This is an OEM replacement part made by Justrite.
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.
Azzota Corp Analytical Calibration Weights Sets, Astm Class F1, 0.001G-200G
Analytical Calibration Weights Sets, Astm Class F1, 0.001G-200G
Azzota Corp Analytical Calibration Weights Sets, Astm Class E2, 0.001G-500G
Analytical Calibration Weights Sets, Astm Class E2, 0.001G-500G
Grainger Calibration Gas 116L Carbon Dioxide 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.