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Troemner OIML Precision Weights conform to the standards of the Organisation Internationale de Metrologie Legale International Recommendation (OIML R 111). They are manufactured from the finest stainless steels available including Troemner Alloy 8 Stainless Steel that has low magnetic permeability, uniform consistency and high resistance to corrosion. Troemner OIML Precision Weights are available in Classes E1, E2, F1 and F2, where Class E1 has the smallest tolerances and Class F2 has the largest tolerances. The letter “E” for Classes E1 and E2 refers to “extra fine” where the letter “F” for Classes F1 and F2 refers to “fine.” OIML R 111 weight specifications are designed so the specifications on surface finish, markings, construction, material density and magnetic properties get more restrictive as the weight tolerances get smaller in order to enable the weight to maintain its tolerance over time. The tolerances for the various classes are established in a manner that enables weights of higher classes to calibrate weights of the next lowest class. For example, Class E2 weights can be used to calibrate Class F1 weights. Troemner OIML Precision Weights and Weight Sets are supplied with Troemner’s Statement of Accuracy, which details the date of calibration and accuracy class of each weight. If your laboratory requires more stringent documentation, please review the Weight Calibration Certificate Options section of this desk reference.


Sheet Metal Weight 500mg – 10mg 316 Stainlees Steel 7.9 g/cm3 at 20ºC
Sheet Metal Weights 5 mg – 1 mg Aluminium 2.7 g/cm3 at 20ºC
Class E1 & E2 One Piece Weights 1 g and larger Troemner Alloy 8 8.0 g/cm3 at 20ºC
Class F1 & F2 Two Piece Weight 1 g – 1 kg Troemner Alloy 8 8.0 g/cm3 at 20ºC
Class F1 & F2 Two Piece Weight above 1 kg 316 Stainless Steel 7.95 g/cm3 at 20ºC
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