Manufactured by DEKA, part number 00222.
Temperature Correcting Battery Hydrometer Professional Type 00231 Deka East Penn
East Penn Deka Temperature Correcting Battery Hydrometer #00231
Float Type Battery Hydrometer, Glass Tube, by East Penn/Deka #00199
Deka Temperature Correcting Battery Hydrometer Tester w/ Built-In Thermometer
Deluxe Professional Battery Hydrometer / Tester Set
Professional Battery Hydrometer / Tester Set 77 F
