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a model 40 if i am not mistaken, circa 1950's or early 60's. if i remember correctly, this model had a fairly low input impedance and is great for eliminating induced or ghost voltages. check the battery compartment for corrosion and fit new batteries.
 
I got one of these of ebay .... if anyone could help with which batteries and leads fit that would be great. Any ideas Tel ?
 
I got one of these of ebay .... if anyone could help with which batteries and leads fit that would be great. Any ideas Tel ?
which model? some has a 15V battery (BLR121) and a 1.5V D cell. some used a 4.5V cycle lamp battery instead of the 15V.

here's a link to the 15V, usually rebuilt with button cells.


AVO 8 METER MULTIMETER 15v BATTERY BLR 121 AVOMETER | eBay - http://www.ebay.co.uk/itm/AVO-8-METER-MULTIMETER-15v-BATTERY-BLR-121-AVOMETER-/272533657404?hash=item3f7445973c:m:mKzmW5neZNKARmiT3rVm50A

ande here's the 4.5V:

1 x MN1203 DURACELL 4.5V Battery Industrial 3LR12 1289 LANTERN - http://www.ebay.co.uk/itm/1-x-MN1203-DURACELL-4-5V-Battery-Industrial-3LR12-1289-LANTERN-/291635891666?hash=item43e6da8dd2:g:L8YAAOSwcOFWaXgz

with the 4.5V, you bend the strips to fit.
 
movement needs zeroing. :). post a pic of the battery compartment.
 
A lovely piece of working history,battery compartment corrosion,being the end of many.

Nowt like an actual needle,to tell you the score...it was good enough for "opportunity knocks" and a Viva HA :)
 
From the link above I found the manual which states 2x4.5v batteries, possibly the type you linked to ?
think you're right there. 2 4.5V side by side.with the 1.5V being a D cell.
 

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