Digital Hydrometer
Red Sea Hydrometer w/ Digital Thermometer
With both continuous and periodic measurement of specific gravity and temperature in "real-time", this hydrometer is a perfect way to ensure proper salinity in your saltwater aquarium.
Merchant: PETsMART
Marine Salt Water Aquarium Starter Kit ()
Marine Starter Kit includes:Hydrometer with digital thermometer for accurate & easy measurement of specific gravityMarineGro, a premium quality, high perfomance color enhancing fish foodBuff Supplement, an essential supplement for maintaining a high buffer capacity and stable pHp
Merchant: Petco