Conform to the accuracy requirements for ASTM hydrometers, are individually serialized, feature readings in 0.1 divisions and feature a metal ballast. Hydrometers include multi-language (English, French, German, Italian, Portuguese and Spanish) Statement of Accuracy indicating accuracy traceable to NIST and DKD/PTB. Tested and calibrated in an exclusive triple accredited/registered ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST and DKD/PTB. Temperature of Standardization 60 degree F/60 degree F.