The Tk-502 Full Range Hydrometer tests the aquarium salt levels and specific gravity. The unit has an easy-to-read 2-color scale with safe zone and has a new no wet hands design with an extra-wide stabilizer base. The full range scale is accurate to +0.001. The unit is made of hard, durable plastic. To use, rinse with fresh water and slowly fill until the water flows up and over the weir. Dislodge the air bubbles by tapping gently. Then place on a level surface, read the scale for gravity and the outside scale for salinity. The recommended gravity for most tanks is 1.020 to 1.024.
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