Nitrate Tester - Can test total dissolved solids/water hardness to test contamination of home purification systems. Instant accurate readout - can display results in 3 seconds with an error of less than 10%. Easy to use color touch screen display with user friendly interface.Let you quickly understand the safety of fruits, vegetables, meat, fish, water and the surrounding environment.Light and com...

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The WHO has released that the COVID-19 virus can spread permanently in an enclosed space, which can spread from person to person. Droplets smaller than 5 microns containing the exhaled saxe-CoV-2 virus can stay airborne for hours and travel tens of meters, the scientists said.  Water droplets are called droplets. With this medical tool, we can kill aerosol particles suspended in the air. ...