... and reliable. 2,Super LCD English, Japanese display LK-3600 Personal Nuclear Radiation DosimeterFeatures1,High sensitivity, stable and reliable. ... grids, power is about 2.8V-3.2V, when battery shows two grids, the power is about 2.5V ... -2.8V, when battery shows one grid, the power is about 2.1 ... V-2.5V, when battery shows without grid , the power is under 2.1V ...