Cheers Marc, I'm more than happy with it.
And to answer your question yes it does change to that parameter when the alarm light comes on
At Mikes price for a new one with ALL the sensors I nearly could of got a new one for the cost of the repair and the new sensors I had to get.
What it does show though after 10-11 years is that they are reliable units which cant yet be proven with the AIM or other units.
PI is also worth considering as thats what I've got to go in the nova when I get the rest of the bits together for it. iirc though they are not cheap new