Description RAPID SENSE SYSTEM A / F RATIO METER For all 4T vehicles The compact design and the presence of internal batteries allow these instruments to be used to measure engine parameters on different vehicles. If you prefer, by connecting the power supply directly to the vehicle, it is possible to use the instrument exclusively on that vehicle. In internal combustion engines (ICE) the air fuel ratio is fundamental so that all the fuel can be used effectively. In fact, it is the quantity of oxygen present in the cylinder that determines how much fuel will be burned, while the excess will be eliminated through the exhaust valve. By installing the supplied oxygen sensor (Lambda) in the exhaust path, the A/F RATIO METER will instantly display the air fuel ratio (ideally 14.7 for petrol) and indicate whether the fuel mixture is too rich (R) or too lean (L). Lambda sensor: Ø 12 Display range: 12.2 ~ 17.2 Backlight: blue color Display unit: 0.1 Effective voltage: dc 12v Battery type: cr 2032 Battery life time: 450 hours Effective temperature range: 10 ° c ~ +60 ° c Instrument dimensions: 69 x 32 x 16 Instrument weight: 48 g The instrumentation is resistant to a few drops of water, but is not waterproof (we therefore advise against placing it under a direct jet of water). Available spare parts: lambda sensor cable 2217752b sensor adapter lambda 5817753 lambda sensor 5817930 Look for the code next to the spare part in the site search to be able to find them buy