These thermo-hydrometers feature non-mercury performance liquid and conform to the accuracy requirements for ASTM thermo-hydrometers. Each thermo-hydrometer is calibrated in a triple accredited ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST. Individually packaged with a multi-language Statement of Accuracy indicating accuracy traceable to NIST. Made in the USA.

Equivalent to H-B Instrument 618220300.