KKmoon 90-260V AC/DC Digital Counter Length Batch Meter 1 Preset Relay Output The meter can be used as a counter to count the quantity of objects in a single batch and the number of batches, and also can be used as length meter. It can be connected with encoder, length counting wheel, proximity switch, photoelectric switch, optical sensor, laser sensor, capacitive switch, etc. 4 kinds of input mode, 6 kinds of output mode for option. Input and output is optical isolated. It can be set alarm value. 6 digits LED Display. Widely applied in chemical, machine, light industry, etc.