... 0-8000RPM 2.direct-viewing,high brightness; 3.convenient to use,easy to install, 4.reliable quality digital Tachometer RPM for ship ... using high-quality MCU as the core part, with digital display tube of high-brightness; easy to install,convenient to use, stable performance, reliable ... : -10~80°c;4.display device: digital display tube of high brightness. Other Tachometer RPM: 0-3000Rpm/0-2000/0 ...