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. It measures 11 inches (280 mm) in length.
'%3e%3cpath%20d='M30%205.625C36.4647%205.625%2042.6645%208.19307%2047.2357%2012.7643C51.8069%2017.3355%2054.375%2023.5353%2054.375%2030C54.375%2036.4647%2051.8069%2042.6645%2047.2357%2047.2357C42.6645%2051.8069%2036.4647%2054.375%2030%2054.375C23.5353%2054.375%2017.3355%2051.8069%2012.7643%2047.2357C8.19307%2042.6645%205.625%2036.4647%205.625%2030C5.625%2023.5353%208.19307%2017.3355%2012.7643%2012.7643C17.3355%208.19307%2023.5353%205.625%2030%205.625ZM30%2060C37.9565%2060%2045.5871%2056.8393%2051.2132%2051.2132C56.8393%2045.5871%2060%2037.9565%2060%2030C60%2022.0435%2056.8393%2014.4129%2051.2132%208.7868C45.5871%203.16071%2037.9565%200%2030%200C22.0435%200%2014.4129%203.16071%208.7868%208.7868C3.16071%2014.4129%200%2022.0435%200%2030C0%2037.9565%203.16071%2045.5871%208.7868%2051.2132C14.4129%2056.8393%2022.0435%2060%2030%2060ZM43.2422%2024.4922C44.3438%2023.3906%2044.3438%2021.6094%2043.2422%2020.5195C42.1406%2019.4297%2040.3594%2019.418%2039.2695%2020.5195L26.2617%2033.5273L20.7539%2028.0195C19.6523%2026.918%2017.8711%2026.918%2016.7812%2028.0195C15.6914%2029.1211%2015.6797%2030.9023%2016.7812%2031.9922L24.2812%2039.4922C25.3828%2040.5938%2027.1641%2040.5938%2028.2539%2039.4922L43.2422%2024.4922Z'%20fill='%2300A046'/%3e%3ccircle%20cx='30.5'%20cy='29.5'%20r='20.5'%20fill='white'/%3e%3cpath%20d='M21.8175%2037H18.7395L13.5915%2029.206V37H10.5135V24.364H13.5915L18.7395%2032.194V24.364H21.8175V37ZM27.1266%2026.83V29.386H31.2486V31.762H27.1266V34.534H31.7886V37H24.0486V24.364H31.7886V26.83H27.1266ZM51.1749%2024.364L47.8809%2037H44.1549L42.1389%2028.684L40.0509%2037H36.3249L33.1209%2024.364H36.4149L38.2329%2033.562L40.4829%2024.364H43.8669L46.0269%2033.562L47.8629%2024.364H51.1749Z'%20fill='%2300A046'/%3e%3c/g%3e%3cdefs%3e%3cclipPath%20id='clip0_10639_3631'%3e%3crect%20width='60'%20height='60'%20fill='white'/%3e%3c/clipPath%3e%3c/defs%3e%3c/svg%3e)
