HAOYI Superior Material: Made of high-quality and environmentally friendly material, durable, safe, and solid to use. High Technology: Real biosensing technology is adopted for measuring skin moisture content in a more accurate way. Smart and Practical Function: A perfect tool for skin humidity measurement, allowing you to know your skin condition anytime. Handy Size: Stylish and portable compact pen design, suitable for home, travel, beauty salon, and professional skincare use. Easy Operation: Simply open the lid and press the tester button for instant measurement. Requires two AAA batteries for power supply (not included). Large LCD Display: Features an LCD backlight display that shows results shortly after testing. Precision data can be read easily, helping you take appropriate steps to care for facial skin. How to Use: 1. For more accurate results, test on a clean skin area free of sweat, hair, or makeup, under indoor temperature conditions. 2. Remove the lid. 3. Press the ON/OFF button to turn on the device. 4. After the "beep" prompt, the display will show a stable "00.0". 5. Hold the probe vertically and gently press it flat against the skin, ensuring full contact (note: fully press the probe into the shell). After the "beep", the device first displays the skin moisture value, then blinks twice to show the skin oil value. 6. Press the "0" button for continuous testing. Follow steps 4 and 5 for subsequent measurements. 7. Backlight turns off 5 seconds after testing; auto power-off after 30 seconds of inactivity. 8. Clean the probe with a soft cloth moistened with alcohol after use. Name: Digital Skin Analyzer Display Accuracy: 0.1% Test Error: 1% Operating Temperature: 540C Relative Humidity: Under 70% Measurement Range: 099.9% Size: 17.5 x 3 x 2.4 cm Material: ABS Color: White Package Contents: 1 x Skin Tester Note: Light and screen differences may cause slight color variations between the image and the actual item. Measurement error allowed is 13 cm.