• NIST Traceable
• Temperature of Standardization 60Â°F/60Â°F
• Metal Ballast
• Individually Serialized
For liquids heavier than water, each hydrometer is calibrated in our 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.