DIGITEN Digital Motor RPM Tachometer Speed Measure Meter 5-9999 LED Red Measure range: 5-9999RPM. Power requirement:DC 8-15V Input sign:Pusle or signal,wet contactor signal,PNP or NPN proximity switch,HALL sensor. Display:RED 0.56" LED Refresh frequency:0.2-0.5S@120-1200RPM;0.25-0.06S@2400-9999RPM.