Lamda meters are high-tech measuring devices for the optimal tuning of your 4-stroke engine. This allows you get get those extra few horse power out of your engine with optimised fine tuning. By means of a lambda probe, the residual oxygen content in the exhaust gas is measured and provides information on the composition of the fuel / air mixture. Similar to how the control unit of a fuel injection system for the 4-stroke works, except that the change of fuel-air ratio on carburated models must be done manually by changing the main Jet. All necessary parts and assembly instructions are supplied. Suitable for all vehicles equipped with 4-stroke engines. Thread: M18x1.5 / Cable length: 200cm. Fuel-air ratio: Display area: 12.2 - 17.2 Display unit: 0.1 supply voltage: DC 12V Battery type: CR2032 battery lifetime: approx. 2,000 hours. Operating temperature range:-10 to + 60 ° C