Function Range: Illumination:(regulate in the standard of 2856K color temperature flat lamp) Note: 1FC=10.76 Lux 0-9999 Lux 1Lux ±(4%rdg+8dgts) ≥10000 Lux 1 10 Lux ±(5%rdg +10dgts) Range: 0-199999 Lux Auto-ranging Sampling Time: 0.5s Refresh sampling in 0.5s Overload indication: OL (Shows "OL") MAX/MIN Measurement: HOLD (Shows "HOLD") Backlight: BL (Manually on and off) Auto Power Off: 5mins (Automatically power off after 5mins without operation) Low Battery: 3.0-3.5V (Shows low battery prompt when power is 3.0-3.5V) Battery: 3 x 1.5V batteries(AAA) (Not included) Size: 160 x 50 x 28mm Weight: 118g