Superior Material:Made of high quality and environmentally material, durable, safe and solid to . High Technology:Real biosensing technology is adopted for measuring skin moisture content in a more way. Smart and Practical Function:A perfect tool 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 and professional skin hospital. Easy Operation:Just open the lid and press the tester button for instant measurement, two pieces AAA batteries for convenient supply(not included). LCD Display:Design with LCD backlight display, showing the result shortly after testing, the data can be read then you can take actions to care for facial skin. How to : 1.For more measuring result, please test on skin area without sweat, hair, or makeup under the indoor temperature. 2.Unplug the lid. 3.Press the ON/OFF button, then light on. 4.After the "beep"prompt tone, the display indicates stable "00.0%". 5.Hold 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. 6.Press "0" button for continuous test, the following steps are as step 4/5 as above. 7.Backlight off 5s after the test, 30s no operation auto off. 8.Please wipe off probe with soft cloth with alcohol. Name:Digital Skin Analyzer Display accuracy: 0.1% Test error: 1% Using temperature: 5-40 Relative humidity: under 70% Measurement scope: 0-99.9% size:17.5x3x2.4cm 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 the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.