Ship type floating design, P67 waterproof grade;4 keys easy to operate, comfortable to hold, one hand to complete accurate value measurement;The three-electrode principle can measure the residual chlorine concentration accurately, quickly and reliably, and can be compared with DPD method.No consumables required; Low maintenance; The measured value is not affected by low temperature or turbidity;The residual chlorine electrode can be replaced by itself; Accurate and stable; Easy to clean and maintain;Can be cast water quality measurement (automatic locking function);Backlit screen, multi-line display, easy to read;Electrode performance state self-diagnostic display;Automatic shutdown after 20 minutes without key action.