- Accurately Read
- Calibrates with Distilled Water
- Automatic Temperature Compensation (ATC)
- No Batteries
Clear & Accurate Salinity Readouts for the Serious Marine Hobbyist
Reef Octopus Refractometer is an incredibly accurate optical device (no batteries) that eliminates the inaccurate readings associated with common inexpensive hydrometers. Very simple to use, just place a couple of drops of water onto the prism and hold up to the light to read. These are an absolute must for the serious marine hobbyist.