... backlight function (backlight for night use), inverted reverse function of numbers on the screen2. Battery capacity display: divide into 3,2and1 grids ... ,6~8 hours7, Stability, temperature drift: 0.2uV/°C(0-60°C),Null drift,≤ 0.1%/8 hours /FS8, Calibration range: ... full-scale calibration.9, Ambient temperature: 0~ 60°C.10, Ambient humidity: ≤ 80%.11, Allowable overload: 150%.12, ...