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 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
Thomas Scientific Calibration Weight Set, F1 Grade, 1mg to 200g (23 pieces)
Accuris™ Instruments offers a range of precision calibration weights that are ideal for calibration of your Accuris lab balances. Each weight meets class F1 tolerance per OIML (International Organization of Legal Metrology) Recommendation R111. Made of highly polished, non-magnetic stainless steel, each calibration weight comes in a protective plastic case. The W1000 series of individual weights come in protective plastic cases with a screw top cover. The W1100-200 Weight Set includes 23 weights ranging from 1mg to 200g and is packaged in a protective carrying case with a set of tweezers, a dust brush and cleaning cloth. Special tweezers, with non-scratching plastic points are also available for proper handling; precision weights should not be touched with bare hands as oils and salts from the skin can stick to the surface of the weights. Class E2 Weight Set Premium Class E2 Weight Set is ideal for calibration of analytical balances with a 0.0001g readability. Precisio
Rice Lake Weighing System WEIGHT 30MG LEAF ASTM CLASS1
Calibration Weight, Rice Lake Weighing Systems, Leaf, 30mg, ASTM, Class 1 SST Polished Density 7.95
Rice Lake Weighing System Weight, 20mg ASTM Class 5
Calibration Weight, Rice Lake Weighing Systems, Leaf Style, 20mg, ASTM Class 5, Stainless Steel, Satin finish, Density 7.95
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.
Rice Lake Weighing System WEIGHT 100LB CAST IRON CL F
Calibration Weight, Rice Lake Weighing Systems, 100lb, Grip Handle, NIST Class F, Cast Iron, Painted
Rice Lake Weighing System Weight Kit,Leaf 500mg ASTM Class 1 Polished Density 7.95
Calibration Weight, Rice Lake Weighing Systems, Leaf, 500mg, ASTM, Class 1 SST Polished Density 7.95
Rice Lake Weighing System WEIGHT SCREW KNOB 10G ASTM
Calibration Weight, Rice Lake Weighing Systems, Screw Knob, 10g, ASTM, Class 1, SST, Polished Density 7.95
Enterprise Technology Solutions 100 Cotton Premium Weight Line
100 Cotton Premium Weight Linen Resume Paper 32 lb Bond Weight 8.5 x 11 Almond 100/Pack
Rice Lake Weighing System Weight, 500mg ASTM Class 5
Calibration Weight, Rice Lake Weighing Systems, Leaf Style, 500mg, ASTM Class 5, Stainless Steel, Satin finish, Density 7.95