HM DIGITAL TRM-1 TDS Meter Triple Inline TDS Monitor Test TDS Levels at 3 points， Come with 1/4" T Fittings， For DI / RO System &More</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Displays TDS levels of the three sensing points with electrode probes</li><li>Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use</li><li>Dual Range 0-9990 ppm (From 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm， the resolution is 10 ppm， indicated by a blinking 'x10' image.)</li><li>Factory Calibrated: calibrated with a 342 ppm NaCl solution. You could directly use it. Meters can be recalibrated with a mini-screwdriver in the future</li><li>Comes with Quick-Connect 1/4" T-fittings</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/21bHWWCpN5L.jpg' noproxy></br>