The re-designed deep six hydrometer with improved calibration and bubble diffuser ensures more accurate readings of your aquarium salt levels. Also includes a built in base so you can rest the hydrometer on a counter top or other ...
Instant Ocean Hydrometer`s new improved design delivers precise full-range salinity and specific gravity readings - accurate to 0.001 - every time. Easy-fill convenience keeps hands dry when filling. It has a durable, permanent ne...
Hagen Living Sea Hydrometer with Thermometer—Small 20cm (8") Accurate Easy to read Thermometer—C & F
Unique intergrated hydrometer and thermometer. Provides accurate measurement of specific gravity (degree of salinity) in a saltwater aquarium. Patented design enables device to be permanently installed inside aquarium, allowing ti...