Tds b & a monitoring units -monitoring tds online value -measures and displays tds values before and after water flows through treatment system, such as ro filtration system for drinking water. -real time calculation of removal rate. -removal rate inducator: removal rate over 80% flash green led lamp, removal rate under 80% flash red led lamp. -large dual window 3-digit lcd display. -generic design fits all systems -velcro mounting -tds detection range: 0~999 ppm -tds sensitivity: 1 ppm -accuracy: +/- 2% -connection: 1/4" or 3/8" t compression screw joint -wake up mode: continuous or button control -battery (included): one 3v lithium cr2032 Dimension: 100mm(w) x 40mm(h) x 8mm(t) Weight: 25g