Specification Brand : Huanyu BulletPoint1 : Class F1 calibration weight set for calibrating other weights, or electronic balances and scales BulletPoint2 : Stainless steel construction for stability, resistance to corrosion, and low magnetic susceptibility BulletPoint3 : Set of 25 weights, tweezers and a protective case BulletPoint4 : Weighing weights--multi-functional and versatile, can be used for home, kitchen, labs, training institution, university, school, etc,Weighting Tool for Labs BulletPoint5 : 200g steel weight-- for making sure that have a properly calibrated scale while weighing,Calibration Weights Color : Silver ExternallyAssignedProductIdentifier : 6023165365535 ItemDisplayWeight : 1.34 pounds ItemName : Huanyu F1 Calibration Weight Kit Stainless Steel High Precision 1mg-1kg 25pcs ItemPackageDimensions_Height : 1.97 inches ItemPackageDimensions_Length : 7.87 inches ItemPackageDimensions_Width : 5.91 inches ItemPackageQuantity : 1 ItemTypeKeyword : calibration-weights Manufacturer : Huanyu Material : Stainless Steel ModelName : Eacamkwh9ax1s7d ModelNumber : J3606BU019 NumberOfItems : 1 NumberOfLithiumMetalCells : 1 PartNumber : L-680 ProductDescription : Production Description Calibration weights are used to measure the weight or mass of an object using a balance or scale, or to calibrate other weights or instruments. Calibration weights can be certified or uncertified. Certified weights meet strict guidelines for accuracy and can usually be recertified. Certified weights are used in labs where a high degree of accuracy and repeatability is required. Uncertified weights are used where a lower degree of accuracy is required, including student laboratories, rough weighting operations, and measuring force. Hooked and slotted weights are often used to measure pressure, torque, and tensile strength, and to demonstrate basic laws of physics. Calibration weights differ from lab weights, which are general purpose weights used to hold an object in place, similar to a paperweight.