TDS Meter Digital Water Quality Tester for RO-RODI System Drinking Water, Aquariums, Hydroponics, 0-9990 ppm Measuring Range, 1 ppm Increments, 2% Readout Accuracy（White）

Really nice to have and carry this tester around to test restaurants’ drinking water, just to see their purity. Granted, there is no good way to test its accuracy, except testing it with either bottled water or distilled water. So far, its reading is very accurate. So, this tester is above acceptable accuracy.

Works well. I love the quick readout (5 seconds hold), quick clear and especially the backlit LCD that's color coded based on the TDS values read by the meter. I've tested 3 samples of water as seen in the photos below. Very much worth the money and works as well as the much more expensive units from Z3r0 water.1. Tap water from water softener - 290 ppm2. Filtered Refrigerator water - 220 ppm3. Reverse Osmosis Filtered water - 13 ppmDifficult to see the Tap/Fridge water values considering how much we pay in taxes to get these most basic utility services. I guess our politicians are too busy pleasing their lobbyist baby sitters siphoning our tax money to burtal and criminal foreign governments!

Red alert at 147 ppm when it's supposed to be red at or above 300. Sending back for another one.