I speced the mechanical one dealer said there would be some maths involved. Not overly worried about it though with a calculator i should be okif it's like the one in my drill it's just a simple total area and trip counter on off display unit handy to know when to check box if set up right
most in to cig lighter or 12 volt outlet wired back to sencer on input shaft
mechanical one OK just can't be reset in a lot of cases so a bit of maths to work back paddock size