1Made of high quality plastic material, safe and eco-friendly, durable and sturdy to use 2The salt tester that uses conductivity test to measure the concentration of salt in liquid food for personal and commercial 3Simple design easy to carry and use, you only need press the switch ON and put the sensor probe head to the liquid at least 2cm/0.8inch, the result will appear. It will auto stop test when you didn't press ''ON'' 4It has colors light indication to tell you concentration of salt. Red shows high salinity (1%-5%), yellow shows moderate salinity (0.9%), green shows lower salinity (0.5%-0.7%), light green shows less salinity (0.3%) 5Lower power consumption. It only needs 3 x LR44 button batteries. If there is green light when you turn on it, it can work normally. Otherwise it's lower power