... buttons operation, easily operate* 6 LED display* Counting mode: counting Up or counting down, counting up and down, selectable by software* CP1, ... ; optional control output: N, F, C, R* Counter speed: 30Hz/300Hz/1000Hz/5000Hz,selectable by software* Modulus:0.00000 ... high voltage: 4~30V, input resistance: 5KΩCounting modeCounting Up or counting down, counting up and downOutput modeN, F, C, RDisplay ...