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I seem to recall Wizard having a go at this but I can't find it on his website.

Perhaps he'll be along later.

Apologies Wizard if it wasn't you.

It was my post, Wizard got one two.

http://cgi.ebay.com/20V-50A-DC-BLUE-LED-Solar-COMBO-Panel-Amp-Voltmeter_W0QQitemZ250485170941QQcmdZViewItemQQptZUK_BOI_Electrical_Test_Measurement_Equipment_ET?hash=item3a521462fd&_trksid=p4634.c0.m14.l1262

This is a digital voltmeter/ammeter, but not temperature sense. It is self powered from the same source that it is measuring.

I would use a momentary push button to work it, that way it cannot be left on accidentally. You can get these from Maplins. I doubt also that you would want this thing glowing all night.

Mine has been working well for 18 months now.

Hope that helps.

I have two panel meters , one measures volts and is powered from the battery it's checking , the other is a amp meter, this has it's own power supply 8 x 1.5 volts batterys , i did try to power it from the caravan battery ( source it was checking ) and it blew the meter . Bought another meter and thinking i'd wired it wrong did the same again and blew that one too , but from what i can remember i managed to repair that one, with some of the bits from the first meter .

atb

Wizard