Measurement Range:TDS: 0 ~ 9999ppm Pen type digital tds meter, all in one, tds electrode is included, FEATURES* ... in 5 mins* Easy to change the tds electrode*Microcomputer circuit, intelligent function, high accuracy* Temperature measurement, °cor°F* Compact size ... 1.5 V battery (LR44) x 4 PCs* Pen type digital tds meter, all in one, tds electrode is included, easy ...