Hikari Accuprobe HydrometerHikari Accuprobe Hydrometer provides certified calibration of a wide range specific gravity meter. This self leveling, hanging device features an auto temperature correcting design and is easy to read. Specific gravity meter Easy to read Self leveling, hanging device The Accuprobe Hydrometer gives specific gravity and salinity measurements and features an internal design that reduces bubble accumulation on the pointer, which improves accuracy.