The Swiss-designed HYDROVOLT battery tester is a heavy-duty, chemical-resistant hydrometer which is direct reading and with build-in temperature compensation accurate at all electrolyte temperatures. Its advanced design incorporates important practical features which simplify battery service as never before; this is the easiest-to-use hydrometer out there. It is also very accurate, beating out any turkey-baster type, and equaling much more expensive refractometers. We at Solacity use a HydroVolt hydrometer ourselves to keep tabs on our forklift battery!
It is a very good idea to take regular hydrometer readings of your flooded lead-acid battery cells. In particular right after a full charge, when it is easy to see if you have a problem with sulphating. Specific gravity readings with a hydrometer are the only accurate way to see what is happening inside your (expensive) deep cycle batteries, and are a way to catch issues when they can still be corrected, before they become a problem.
Regular (say once-every-two-months) hydrometer readings, and keeping a log of those readings for each cell (number the cells with a Sharpy) will also go a long way if it is ever necessary to make a warranty claim with a battery manufacturer. You will stand much stronger when you can show with a log that the battery was maintained well, but despite that a cell just went ‘bad’, it happens.
These are Specific Gravity values for regular deep-cycle flooded lead-acid batteries versus the State-Of-Charge of the battery cell:
The HydroVolt is identical to MidNite Solar’s ‘MNHydrometer’ product. Solacity just imports them directly from the manufacturer in Europe, we do not get them from MidNite Solar.
- Handy compact size for use with hard-to-get-at batteries
- Large, easy-to-read scale with quick-check coloured sectors
- Readings independent of vertical positioning of instrument
- Fast, bubble-free intake of fluid sample
- Automatic air-lock prevents fluid loss and air bleed
- Unrivalled automatic temperature compensation and measuring accuracy
- Sturdy, shock-resistant materials, noncorrosive throughout
For the modest price this is truly the best hydrometer out there, and a must-buy for anyone with flooded lead-acid batteries!