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 100G ASTM CLASS 2
Calibration Weight Kit, Rice Lake Weighing Systems, 100g, ASTM Class 2, SST Satin, Density 7.84, Electronic Balance Calibration Weights
Rice Lake Weighing System Weight, 20kg ASTM Class 6
Calibration Weight, Rice Lake Weighing Systems, 20kg, Grip Handle, ASTM Class 6 Cast Iron, Painted
Rice Lake Weighing System Weight, 2oz ASTM Class 5
Calibration Weight, Rice Lake Weighing Systems, Cylindrical, 2oz, ASTM Class 5, Stainless Steel, Satin finish, Density 7.84
Cayman Chemical E2 2Chlorostyryl3 5 6 25mg
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
Calibration Weight Kit, Rice Lake Weighing Systems, 500g-1mg, ASTM Class 1 SST Polished (5321)
Calibration Weight Kit, Rice Lake Weighing Systems, 5lb- 1/32 oz, NIST, Class F, SST Satin, 31lb Kit
Grainger G0364 Slotted Toolboard Hook Kit 1 in
The Grainger 14K279 is a Westward brand 1/4-inch drive socket set. This 108-piece socket set includes both SAE and metric sockets ranging from 1/4 inch drive to 3/4 inch drive in shallow, deep, and universal depths. The set is made from chrome vanadium steel and comes packed in a sturdy plastic blow mold case for storage and portability. This socket set is ideal for automotive and machinery repair and maintenance.
Perkin Elmer US LLC Balance Tare Weight - TGA 7
This weight comes standard with the TGA 7 Sample Supplies Kit (N5190207).
Rice Lake Weighing System Weight, 1lb ASTM Class 5
Calibration Weight, Rice Lake Weighing Systems, Cylindrical, 1lb, ASTM Class 5, Stainless Steel, Satin finish, Density 7.84
Rice Lake Weighing System WEIGHT KIT 5KG ASTM CLASS 4
Calibration Weight Kit, Rice Lake Weighing Systems, 5kg, ASTM Class 4, SST Satin, Density 7.84, Electronic Balance Calibration Weights
Rice Lake Weighing System WEIGHT KIT 2MG ASTM CLASS 0
Calibration Weight Kit, Rice Lake Weighing Systems, 2mg, ASTM Class 0, Density 2.7
Rice Lake Weighing System WEIGHT KIT 100G ADJUSTED
Calibration Weight Kit, Rice Lake Weighing Systems, 100g Adjusted, ASTM Class 1, SST Polished, Density 7.84, Electronic Balance Calibration Weights
Rice Lake Weighing System WEIGHT KIT 500G ASTM CLASS 4
Calibration Weight Kit, Rice Lake Weighing Systems, 500g, ASTM Class 4, SST Satin, Density 7.84, Electronic Balance Calibration Weights
Rice Lake Weighing System WEIGHT KIT 200G ASTM CLASS 4
Calibration Weight Kit, Rice Lake Weighing Systems, 200g, ASTM Class 4, SST Satin, Density 7.84, Electronic Balance Calibration Weights
Rice Lake Weighing System WEIGHT 200G CYLINDRICAL CL F
Calibration Weight, Rice Lake Weighing Systems, Cylindrical, 200g, NIST Class F, SST, Satin Density 7.84
Grainger Calibration Gas 116L Carbon Dioxide 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 16N074 model contains air at approximately 2000 psi fill pressure.