Specifications:

The testing procedure is simple and quick. Remove the cap of the Rokid, pouring the purified water into the cave, then press the Test button. It takes only a few seconds to know your water quality.

If the red light is on, it means the water quality is bad. The membrane and filters are out of function, you need to replace them immediately. If the green light is on, it means the reverse osmosis water purifier works well, you can drink the water safely.