Features: Wide measurement range from 1 to 200,000 lx, with switchable Lx or FC units. Maximum and minimum reading hold function. Compact and lightweight design for easy portability. 3 1/2 digit LCD display provides clear, convenient, and intuitive data observation. Separate measuring head and display meter design, suitable for use in complex environments. Ideal for monitoring light intensity in homes, laboratories, offices, schools, indoor farming, and similar settings. Specifications: Item Type: Luminometer Material: Plastic Color: As shown in picture Weight: Approx. 194g / 6.8oz Unit of Measurement: Lx / FC Display Resolution: 0.1Lx / 0.01FC Display: 3 1/2 digit LCD Measuring Range: 1Lx - 200,000Lx Sampling Rate: 2.0 times/sec Repeat Test: 2% Temperature Characteristics: 0.1% per °C Photosensitive Element: Photodiode with filter lens Power Supply: 2 x AAA batteries (not included) How to Use: 1. Power Switch Button: Press to turn the device ON or OFF. 2. Maximum/Minimum Measurement Button: Press once to display "MAX" and enter maximum measurement mode. Press again to display "MIN" for minimum measurement mode. Press again to exit and return to real-time readings. 3. Data Hold Function: Press the HOLD button to lock the current reading (display shows "HOLD"). Press again to release the hold and resume measurement. 4. Range Selection Button: Press repeatedly to switch between measurement ranges. When "AUTO" is displayed, the device automatically selects the appropriate range based on light intensity. If "AUTO" is off, manual range selection is active. If the reading exceeds the current range, the display will show "OL"; manually press RANGE to switch to a higher range. 5. Function Setting Button: Press and hold the MODE button for over 5 seconds to enter unit selection mode. The display will flash "Lx". To switch to "FC", press the HOLD button. To switch back to "Lx", press the MAX button. After unit selection, press MODE once to enter data recording settings. Package List: 1 x Luminometer (batteries not included) 1 x Instruction Manual