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TDS Water Quality Tester used to test the value of water, electrical conductivity of water to determine the purity of the water. With both test water temperature and environment temperature functions. It can be widely used in water treatment industry, drinking water industry, household, personal home travel and field operations Performance indicator: 1.Testing item: Water value ppm(mg/L),Conductivity us/cm, Celsius degree ℃ Fahrenheit degree℉. 2. Basic Function: ON/OFF/HOLD Function: ON: In the off state, press this button to boot. Auto-off: No operation, auto-off after 5minutes. Manual shutdown: Continue to press ON/OFF button 3s shutdown. Function selection button(MODE): default display test water quality values ppm total dissolved solids; press this button, display test water conductivity us/cm value, press again, display Celsius degree ℃,press once to display Fahtenheit ℉;and then repeat the cycle above CLEAR" Function: reset .remove lock reading and re-test. Auto-test & Lock reading: insert into water can be auto-reading after quality shows corresponding TDS value or conductivity us/cm. Then automatically locked. Scale function: According to national standard scale and appropriately reference international practice. Direct drinking water warning reference to national standard adopted TDS=40 as a dividing line,<40 green backlight display for qualified direct drinking water,>40 red backlight display for non-drinking water. TDS read range: 0-9999, identifier 3.Power supply voltage: CR2032 ( buttoncell ),DC3V;230mAh. 4.Test range:TDS:0~9999ppm 5.Accuracy:+/-2% F.S 6.Temperature measurement range:0-99℃(Fahrenheit 32~212℉),accuracy±0.1℃ 7.Use environment:0-50℃ Maximum relative temperature is 95% 8.Size:16.2*2.9*1.5(cm) Package contains: 1 x TDS Meter K-15 1 x TDS Meter Carrying Case 1 x TDS Meter User Manual