Might Max Battery Hydrometers are designed to detect a battery's state of charge by sampling the electrolyte from each cell. The hydrometer contains a floating indicator that represents the density of the electrolyte – the more dense the electrolyte the higher the battery's state of charge.
Mighty Max Battery Hydrometer
– Thick wall plastic body resists breakage
– Direct dial scale features oversize markings
– Immediately and accurately tests battery life whether the battery is hot or cold
– Works on all 6-12-24 volt systems
– Includes a Step-by-step instructions on body