Check the listing for details. HM Digital TDS-EZ PPM Meter, Home Drinking Tap Water Quality Purity Test/Tester. Condition: New. Listed at 18.99 USD. Ideal for all basic water testing applications. The best value meter in the world!FeaturesEconomy model that is ideal for end-users.Highly efficient and accurate due to its advanced microprocessor technology.Hold Function: saves measurements for convenient reading and recording.Auto-off function: the meter shuts off automatically after 10 minutes of non-use to conserve batteries.Measurement Range: 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1ppm. From 1000 to 9990 ppm, the resolution is in increments of 10ppm, indicated by a blinking 'x10' image.Display: large and easy-to-read LCD screen.our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.Fun, translucent blue housing that's very strong and durable.Includes a TDS chart sticker on the back of the meter that explains TDS values.SpecificationsRange: 0 - 9990 ppm (mg/L)Resolution: 0-999: 1 ppm; 1000-9990: 10 ppm (indicated by a 'x10' icon)Accuracy: +/- 3%EC-to-TDS Conversion Factor: NaCl (avg. 0.5)Power source: 2 x 1.5V button cell batteries (included) (LR44 or equivalent)Battery life: Approx. 1000 hours of usageDimensions: 15.5 x 3.1 x 2.3cm (6.1 x 1.25 x 1 inches)Meter weight: 56.7g (2 oz)Weight with package: 76.5g (2.7 oz) UPC: 891144000168