The skin analyzer reads an electrical resistance of your skin that will depend on the hydration. The dryer the skin, the higher the resistance. The skin full of moisture will have much lower resistance as water is excellent electricity conductor. The results on the same spot may vary, as they will depend on many factors - humidity, sweat glands activity, cosmetics, etc.
Skin moisture analyzer is a portable device that uses Bio-electric impedance analysis (BIA) technology.
Skin moisture analyzer immediately and automatically detects skin conditions and displays the result on LCD screen as percentage numbers.
The best time to take a test is after you evening make up removal and drying the face.
After applying the night cream you may repeat the test and see how good your usual moisturizer works.