Soil Hydrometers

These soil hydrometers are calibrated at 20°C (68°F) and manufactured to the specifications of the American Society for Testing and Materials (ASTM). Model 67151H measures the specific gravity of soil samples in suspension and model 67152H measures the amount of soil colloids in grams of soil samples in suspension. Both models measure 11 inches (280 mm) in length.                                             Specifications                                                                                                                            Item No. ASTM No. Specific Gravity Range Soil Colloids Range Subdivisions 67151H 151H 0.995 to 1.038 N/A 0.001 67152H 152H N/A -5 to 60 Grams 1.0