Product Description:
Accurate, simple, and essential — the Green Tide Glass Hydrometer + Thermometer Combo is an all-in-one tool for monitoring salinity and temperature in your marine or reef aquarium. Designed for saltwater use, this glass floating device provides real-time readings of specific gravity (1.000–1.060) and temperature, helping you maintain stable and healthy water parameters.
With a clearly marked green zone indicating optimal salinity and temperature levels, it's easy to read and understand — perfect for both beginners and advanced reefers.
Features:
✅ Measures both specific gravity (SG) and temperature
✅ Green zone indicators show ideal marine parameters
✅ Float-style glass design – no calibration required
✅ Safe and accurate for saltwater/reef tanks
✅ Simple to use: just float it in your tank or sample container
✅ Size: 20cm long (7.87")
 
How to Use:
Gently place the hydrometer into your aquarium or a sample container of water.
Let it float freely.
Read salinity and temperature against the scale.
If the water level is below the green zone, add freshwater.
If it’s above the green zone, add saltwater.