Tachometer Koso RPM Mini 4 This mini LCD meter developed by KOSO has the function of detecting the current speed. The battery-powered device can be connected to any engine running on fuel. The life of the internal CR2032 battery is approximately 350 hours. details: Display range: 0-15000 rpm Distribution: 10 rpm The instrument starts to work automatically after switching on. Battery life: 24 hours a day, about 100 days, about 350 hours, battery type CR2032 + 12 volt voltage on board Automatic sleep mode: the instrument goes into sleep mode if no new signal is received for more than 30 seconds. Sensor cable length: approx. 120 cm Operating temperature range: -10 ° C to + 60 ° C Width x length x height: 69.8 x 34.4 x 17.2 mm