This Aqua One Marine Glass Thermometer / Hydrometer floats and is easy to read. Green bar indicates the prefered temperature / salt level for most aquariums.
Key Features:
- Ideal for the Nanoskim 40 and 90
- Floating Glass Hydrometer with Thermometer
- For Saltwater Aquariums
- Easy Accurate Reading
- 10 - 50C
- Indicators for safe range