Features:  The tachometer has the characteristics of small volume, high cost performance, quick reaction speed and beautiful appearance.  Applicable to a variety of mechanical equipment of the motor speed detection, the use of this instrument can accurately measure the engine and the speed of various motors, the built-in menu to select Frequency test.     Specification:  Power supply: DC8V~15V power supply.  Overall Dimension: 72mm x 36mm x 20mm.  Opening size: Long 68mm x 33mm.  Installation mode: Embedded.  Accuracy: 5000rpm: 2rpm.  Refresh Speed: 120-1200rpm: 0.2-0.5s 2400-9999rpm: 0.25-0.06s.  Range of measurement: 5-9999 rpm/per minute.  Time of back to zere: 5-9999rpm: 10s 1-9999rpm: 60s.  Display: Super highlight 0.56 inch LED digital tube display.  Input signal: Voltage pulse signal, active contact signal, PNP or NPN proximity switch.     Package Includes:  1 x RPM Speed Meter