Divolight [pH and TDS & EC Tester kit] pH Tester Digital Accuracy 0.01 Lab PH Meter Pen Type pH Meter and 3 in 1 TDS Meter, PPM pH Meter for Water, Practical Water Testing Kit pH and TDS Meter Combo pH and TDS & EC Tester kit auspowers_batchfour Compatible Models: XTN Serites: XTN446 Size:1 m Compatible Models: XTN Serites: XTN446 HYS SMA Female Handheld Dual Band Antenna 15 Any measurement higher than 1000 ppm is an unsafe level of TDS You have to know
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