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 for skin humidity measurement, then you can know your skin state anytime you want. Handy Size:Stylish and portable in compact pen design, good for the home, travel, beauty salon and skin hospital. Easy Operation:Just open the lid and press the tester button for measurement, two pieces AAA batteries for convenient supply(not included). LCD Display:Design with LCD backlight display, showing the result shortly after testing, the precision data can be read then you can take actions to care for facial skin. How to Use: 1For more accurate measuring result, please test on skin area without sweat, hair, or makeup under the indoor temperature. 2Unplug the lid. 3Press the ON/OFF button, then light on. 4After the "beep"prompt tone, the display indicates stable "000%". 5Hold the probe vertically to the testing area, closely attaching the probe to skin(note: totally press the probe into the shell). After the "beep", it firstly displays the skin moisture value, then flickers twice to display the skin oil value. 6Press "0" button for continuous test, the following steps are as step 4/5 as above. 7Backlight off 5s after the test, 30s no operation auto off. 8Please wipe off probe with soft cloth with alcohol. Name:Digital Skin Analyzer Display accuracy: 01% Test error: 1% Using temperature: 5-40 Relative humidity: under 70% Measurement scope: 0-999% size:175x3x24cm Material:ABS colour:white Package Contents: 1 * Skin tester Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.