On Sun, 02 Jun 2019 11:03:03 +0100, Jim K.. wrote:

How much should the op spend on a "proper multimeter" to do the
job properly?

You don't have to spend a fortune. I use one of these for anything to do
with the mains: https://tinyurl.com/y49d475v

But cheaper still options are available.



--
Leave first - THEN negotiate!