[Barnmead]

Thank you everyone for clarifying the push button types. I have amended the description as follows but if anyone has the appropriate army reference (probably ZD.....) please advise.

This one is the same as the model 8 Mk1 except that it is fitted with an extended metal push button with rubber boot to reverse the moving coil.

This type of pushbutton was used on some miitary versions but not all and some if not all have a steel outer casing with an earthing terminal.

These instruments preceded the Test Set No.1 (see below) which has ranges in multiples of 1 and 3 like the model 9 rather than 1 and 2.5 of the model 8