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, 8oz ASTM Class 5
Calibration Weight, Rice Lake Weighing Systems, Cylindrical, 8oz, ASTM Class 5, Stainless Steel, Satin finish, Density 7.84
Thomas Scientific Calibration Weight, F1 Grade, 200g
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
Uline Stainless Steel Weight With Nist Traceable Certificate - Class 5, 5 Lb
Stainless Steel Weight With Nist Traceable Certificate-Class 5 5 Lb
Enterprise Technology Solutions Seal Closure Bags, 2 Mil, 4" X 4", Clear, 1,000/Carton
ABILITYONE 8105008377753 Skilcraft General storage plastic bags with seal closure provide storage, protection and easy identification for multiple items.
Rice Lake Weighing System Weight, 10kg ASTM Class 6
Calibration Weight, Rice Lake Weighing Systems, 10kg, Grip Handle, ASTM Class 6, Cast Iron, Painted
Uline Stainless Steel Weight With Nist Traceable Certificate - Class 5, 200 G
Stainless Steel Weight With Nist Traceable Certificate-Class 5 200 G
Grainger Calibration Gas 116L Hexane 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.
Cayman Chemical E2 2Chlorostyryl3 5 6 10mg
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
MSC HEX KEY SETS, RANGE (MM) 1.5
WERAHex Key Sets; Tool Type: Hex ; Handle Type: L-Key Long Arm ; Measurement Type: Metric ; Hex Size Range (mm): 1.5
Grainger G0363 Slotted Toolboard Hook Kit 1 in
The Wall Control Slotted Toolboard Hook Kit includes 24 metal hooks for slotted pegboards or slatwall panels. It features 8 small hooks (2-3/4"), 8 medium hooks (4-1/4"), and 8 large hooks (5-3/4"). Made from steel with a black oxide finish, these hooks resist corrosion. They have a rounded top and pointed tip for easy slot insertion. This versatile kit is ideal for organizing tools and more. Manufactured in the USA by Wall Control, known for retail and storage products.