Features: Remote monitor for PH Emitter(PH stick)send PH value to receiver by wireless signal Date transfer open distance is up to 80m Emitter is sealed waterproof structure which can be put in water A receiver can work with max. 6 emitter,Ph value is displayed by turns When many monitors work together,receiver only receives the emitter's own signal,different sets don't interfere each other. Specifications: Emitter Measure range:4.1~8.8PH Resolution:0.1 Accuracy:+-0.1 Automatic temperature compensation:0C~50C Auto caliberation:2-point caliberation or single point caliberation Display:LED Power supply:3x5# batteries(not included) Weight:60g Receiver LCD display:PH value and emitter number Receiving distance:80m Power supply:DC6V Dimension:100x146x48mm weight:10g