Plugs into the consult port on Skylines, can read out most of the info the ECU knows about, such as water temp, injector cycle, ignition timing, o2 sensor voltages etc.
Also will read out any ECU error codes, if it has any.
Handy bit of kit
Unit only, no box/instructions (although they are on the net somewhere).
£170 delivered in the UK, paypal add 4%