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 2KG ASTM CLASS 2
Calibration Weight Kit, Rice Lake Weighing Systems, 2kg, ASTM Class 2, SST Satin, Density 7.84, Electronic Balance Calibration Weights
Creative Biomart Urokinase
The product, that consists of an A chain of 2,000 daltons linked by a sulfhydryl bond to a B chain of 30,400 daltons. Recombinant urokinase plasminogen activator.
Rice Lake Weighing System Weight, 2g ASTM Class 5
Calibration Weight, Rice Lake Weighing Systems, Cylindrical, 2g, ASTM Class 5, Stainless Steel, Satin finish, Density 7.84
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 16 liter aluminum cylinder contains 99.9% pure air balanced with nitrogen. It has a working pressure of 1800 psi and comes with a CGA-590 outlet connection that is compatible with many gas detectors. The cylinder should be stored and used in accordance with local regulations. This calibration gas is useful for ensuring accurate readings when using gas detection equipment.
Teledyne ISCO, Inc Hk, M1, .250, Stainless Steel, 1A, Double
HK, M1, .250, STAINLESS STEEL, 1A, DOUBLE
Grainger Calibration Gas 116L Carbon Monoxide Air
The Grainger 116L Calibration Gas Carbon Monoxide Air is a 116 liter cylinder of calibration gas containing 10 parts per million carbon monoxide in air. This gas mixture is used for calibration and bump testing of carbon monoxide gas detectors to ensure proper operation and response. The cylinder has a CGA-590 outlet connection and comes equipped with a carrying strap for portability. The gas mixture is certified to NIST traceable standards and has a shelf life of 18 months. This product can be used for calibration of carbon monoxide sensors in gas detection equipment.
Rice Lake Weighing System Weight, 50mg ASTM Class 5
Calibration Weight, Rice Lake Weighing Systems, Leaf Style, 50mg, ASTM Class 5, Stainless Steel, Satin finish, Density 7.95
Rice Lake Weighing System WEIGHT KIT 8OZ-1/16OZ CL F
Calibration Weight Kit, Rice Lake Weighing Systems, 8oz- 1/16 oz, NIST Class F, SST Glass Bead, 1lb Kit
Rice Lake Weighing System WEIGHT 5KG CAST INTRLOCK
Calibration Weight, Rice Lake Weighing Systems, Slotted, Interlocking 5kg, 6- 5/32 Dia x 1- 25/32 H x 3/4 Slot Width, ASTM Class 7, Cast Iron, Painted
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 99.995% pure air balanced with nitrogen. It has a working pressure of 1800 psi with CGA-590 outlet connection. This calibration gas is recommended for calibrating and checking zero readings on gas detection instruments including combustible gas indicators, oxygen analyzers, and other air sensitive devices. The cylinder is refillable and includes a 5 year retest date. This is a high purity calibration gas used for accurate instrument calibration.