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GTP-3012-1AAPI Gravity & Relative Density Calculator to convert observed reading to a constant 60 deg. F
GTP-2727EFConverts Density Reading Taken With a Hydrometer to Corrected Density at 15 Degrees Celcius
GTP-8810-GBJet/AVGAS API Density Kit with 3 Thermohydrometers, Jar, and Calulator