ASTM Hydrometers, with works calibration and 3 checkpoints

Precision hydrometers acc. to ASTM E2995-14 for determination of density for mineral oil, with thermometer "mercury free".
Hydrometer with thermometer, error-limit for density: ± 0,5 kg/m³, with thermometer -20 to +65°C in 1°C, blue filling, error-limit ± 1°C. With blue, environmental friendly filling of thermometers. Each item packed in plasic tubes for breakage protection.