Gill aircraft battery hydrometers are used to easily check the electrolyte level of your battery and tells you the correct ratio of liquid to the density of water. It requires only a small amount of fluid and is ideal for close quarters.
Tests for 6, 12 and 24 volt batteries
Is calibrated to provide accurate measurements
Small enough to fit in your pocket or keep on your airplane
Placed order 11-26-25, finally received 12-30-25. Didn’t know it was a back ordered item. Customer service was helpful but it was frustrating to wait that long.
Item works but the radio plug doesn’t stay in so I had to make a retainer
