All three readers I have will also display live data in running so you can look at a large amount of parameters such as revs, speed, voltage, coolant temp, outside air temp, air temp within inlet tract, barometric pressure, boost pressure, fuel rail pressure, EGR operation and loads more.
They will also reveal car data such as mileage recorded (not always same as speedo shows), number of times the car has started in its life, how many hours it's run for in its whole life.... fascinating stuff.
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