Features: Made of high quality ABS material, it is durable, corrosion resistant and wear resistant. With large-screen LCD display, it can visually display the illuminance measurement value and measure accurately. The measurement range is 0.1~200,000Lx, 0.01~20,000Fc, the measurement accuracy is 4%, and the measurement is more convenient. With a lock screen function (Hold) for maximum/minimum measurement. Support auto range, can switch range manually, 15 minutes no operation will automatically shut down function. The meter will automatically detect the battery level. When the low battery symbol is displayed, please replace the battery in time. Specification: Condition: 100% Brand New Material: ABS Measuring Range: 0.1~200,000 Lx, 0.01~20,000Fc Resolution: 0.1Lx / 0.01Fc Measurement Accuracy: 4% Sampling Frequency: 2 Times / Sec Unit: Lx, Fc Working Environment: 14 To 122F (-10 To 50C), 10%~90%RH Storage Environment: 14 To 131F (-10 To 55C), 10% To 95% RH Battery: 1 x 9V Battery (Battery Not Included) Weight: Approx. 130g / 4.6oz Size: Approx. 145x67x32mm / 5.7x2.6x1.3in Package List: 1 x Light Meter (Battery Not Included) 1 x Instruction Manual Appearance description: 1. MAX/MIN maximum/minimum measurement identification 2. Measurement reading display 3. AUTO automatically switches the range indicator 4. Meter power button / power off button 5. Mode switch button, short press the switch unit, long press to switch the normal / maximum / minimum mode 6. Illumination sensor components 7. HOLD lock screen logo 8. Battery low voltage identification 9. Illuminance unit, Lux: Lux, Fc: foot candle 10. The multiple of the reading is multiplied by the value X. This multiple is the reading. 11. Display the current range 12. HOLD button, short press the lock screen, long press to switch between auto range and manual range Measurement steps: 1. Remove the protective cover according to the direction mark. 2. Press the key to boot. 3. Short press the MODE button to select the desired unit Lux/FC, long press the MODE button to select the desired mode, divided into: current measurement / maximum measurement / minimum measurement, short press HOLD button to lock the screen. 4. The meter automatically measures by default. If you need to manually switch the range, press and hold the HOLD button to cycle through the range. 5. Take the meter to the top of the optical sphere and face the light source to get the reading. 6. Press the key to shut down and cover the protective cover. Button function introduction: Switch button: switch function. MODE button: Short press to switch the measurement unit Lux / Fc. Long press to switch the measurement mode, divided into current mode / MAX maximum measurement / MIN minimum measurement. HOLD button: Short press for lock screen function, long press cycle to switch range, jump back to automatic mode after loop: 200 --> 2000 --> 20000 --> 200000. Automatic shutdown function: The instrument has an automatic shutdown function, the button does not operate within 15 minutes, the meter will automatically cut off the power to save battery loss. Maintenance: When the instrument is not in use, it should be stored in a dry/cloudy dry environment. If it is not used for a long time, please remove the battery to prevent the battery from leaking and damaging the instrument. Battery replacement: When the meter screen displays the battery low voltage indication, it indicates that the battery is nearly exhausted and you need to replace it with a new one: 1. Remove the battery cover on the back of the meter. 2. Replace