Digital Tachometer Gauge, DROK 0.56" Tiny Tachometer Panel 60-9999 RPM Speed Rate Measure Meter DC7-30V 12v 24v Motor Engine RPM Tester Velocimeter with Green LED Display This is a digital Tachometer gauge with measuring range of 60-9999 RPM, power supply is DC 7-30V The small speed measuring meter has 0.56 inch LED digital display and a high refresh rate about 4Hz, just 3S to reset to zero A Voltage pulse signal, active shock signal, PNP/NPN Proximity switch signal, hall Proximity switch Characterized by its high accuracy and tiny Size which makes it easy be embedded installation Our RPM tester can be applicable to all kinds of machinery and equipment motor speed detection