In-Line EC & pH Monitors feature a large LCD display showing a constant EC or pH reading. It has high and low adjustable set-points and insertion-type probes that can be easily removed for cleaning or calibration. The analog signal at probe is converted to digital to allow for long cable runs. These monitors/controllers provide continuous watch over the injection system. Model P-1 pH Monitor will continuously monitor your water for proper pH levels with a range of 1-13 pH. Its accuracy is within 0.1 pH at 77° F.