Glass hydrometers Standardized Hydrometers ISO 649-NF B 35511-BS 718-DIN 12791 Standardized Specific Gravity Hydrometers ISO 650 60/60°F (15.56°C) Standardized hydrometers A.S.T.M. E100 Standardized Hydrometers ASTM E100 (D422) Standardized Hydrometers BS 1377 Standardized Hydrometers NF T60101 Standardized Hydrometers ISO 649 SP - NF B35511 SP - BS718 SP - DIN12791 SP Standardized ASTM E100 . Canadian Government Agreement Standardized ° API Standardized hydrometers for oil and gas industry Draft survey hydrometers ECE / ENERGY/19. Standardized Hydrometers for milk Non standardized density hydrometers Non standardized hydrometers - in Specific Gravity Non standardized Baumé hydrometers Non standardized milk hydrometers For breweries and sugar Brix Saccharometers Twaddle hydrometers Hydrometers for diverse utilisations