Superior Material:Made of high quality and environmentally friendly material, durable, safe and solid to use. Multiple Functions:Can be used to test skin moisture, oil, elasticity; can be used to test environment temperature and humidity; with the fluorescer function, can be used to test the fluorescer. Smart Memory Function:8 groups of the latest test results can be saved for later check by pressing the 'O' button. Highly Sensitive Probe:Highly sensitive probe provides more precise test result. 1 button operation presents more convenient using experience. Handy Size:Stylish and portable in compact pen design. Mini size makes it good for home, travel, beauty salon and professional skin hospital. LCD Display:With backlight, you can check it even in the dark place. LCD display for more convenient and readable using. Fluorescer Detector Light:Long press the 'O' button, the bottom light turns on for detector. Temperature and Humidity Detector:Short press the ON/OFF button instantly enters the detector of temperature and humidity. Power supply: USB Battery capacity: 300mAh Voltage: 3.7V Charging time: . 2hours How to Test: 1) the lid. 2) Long press the ON/OFF button for power on. 3) Press the probe closely to skin for testing. 4) Beep voice indicates that the test is complete.(Green indicates good condition, yellow indicates normal condition, yellow indicates the shortage of moisture) Colour:White Material:ABS Package Contents: 1 x Water Oil Moisture Tester Only the above package content, other products are not included. Note: Light reflection 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.