Specification:Material: ABS + PCSize: approx. 122 * 34 * 25mm / 4.8 * 1.3 * 0.98inchBattery: 2 x AAA Batteries (Not included)Package Included:1 x Skin TesterForehead: normal value is 35% -60%Eye: normal value is 50% - 60%Face: normal value is 35% - 60%Hand: normal value is 40% - 65%The reference value of skin oil:The moist skin: 16% - 22%Normal skin: 23% - 33%Oily skin: 34% - 63%The introduction of the skin elasticity:The 5 different expressions on the LCD display shows the different skin elasticity, more details are referred in the picture.Instruction:1. Press power button, making probe touch measured part, screen will begin to roll, measurement results being showed when you hear the sound.2. 10 seconds after finishing the test, light will be off in 4 minutes, or you can press the power button for 3 seconds to turn off.2. The usage of fluorescent detecting: press the " 0 " key for 3 seconds or so in the state of turning on. The tail of the machine will light, and expose the object on the light and the blue light means that object containing fluorescent.3. This tester has 10 groups of memory functions, you can touch the "O" key lightly to see about the last testing result and every time when you touch the"O" key, the records will show circularly from the last time to the tenth time.Note:1. Red light is a serious shortage of moisture, green is the balance between water and oil.2. It shows " Err", the probe is not be close touch with the skin surface, please put probe vertical to the skin surface or the probe is contaminated, please clean it.3. With the probe being close touched skin, but the screen has no rolling pictures, which means that the skin is dry that is beyond the testing range, please change other areas.