Superior Material: Made of high-quality and environmentally friendly material, durable, safe, and solid for use. Multiple Functions: Can be used to test skin moisture, oil, and elasticity; can measure environmental temperature and humidity; includes a UV light function to detect fluorescent substances. Smart Memory Function: Stores up to 8 groups of the latest test results, which can be reviewed by pressing the 'O' button. Highly Sensitive Probe: The highly sensitive probe delivers more accurate test results. One-button operation ensures a convenient user experience. Handy Size: Stylish and portable compact pen design. The mini size makes it ideal for home use, travel, beauty salons, and professional skincare settings. LCD Display: Features a backlight for easy viewing in low-light conditions. The LCD screen provides clear and readable results. Fluorescer Detector Light: Long press the 'O' button to turn on the bottom UV light for detection. Temperature and Humidity Detector: Short press the ON/OFF button to instantly activate temperature and humidity measurement. Power Supply: USB charging Battery Capacity: 300mAh Voltage: 3.7V Charging Time: 2 hours How to Test: 1) Remove the lid. 2) Long press the ON/OFF button to power on. 3) Press the probe gently against the skin to begin testing. 4) A beep sound indicates the test is complete. (Green indicates good condition, yellow indicates normal condition, and flashing yellow indicates low moisture.) Color: White Material: ABS Package Contents: 1 x Water Oil Moisture Tester Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement error is +/- 1-3 cm.