Entity Jonathan Farrugia uttered this profundity:

> all the stores in close distance to my house showed them but there was
> only the one on the shelf at the closest store, which i bought :).
> i don't know if > it stated in the web description but it runs on either
> two AAA batteries or 12 volts, to run the temperature functions that is.
> i had wondered about it being a parasitic drain on the system.

 Cease thy wonderment! I measure it at 27 mA per hour, which is .648 amp per
day. Hardly significant for daily driving.
I notice the backlight is on all the time when the unit is on 12v. Pretty
good idea. I wonder if I put batteries in it if it would only show the
backlight when it has external 12v? Anyone?

-- Gnarlie