Download The "tuya" App, Wifi Connection and Easily Get PH TDS EC S.G and Temp Readings In Seconds. Moder : PH-991W PH TDS EC S.G Temp Water Quality Tester. TDS Rang:0-19900ppm,0-199.0ppt. TDS Resolution : 1ppm(<1999ppm) 10ppm(>1999ppm) 0.1ppt.
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