I personally do not own a proving unit , I carry 2 volt pens and a multi meter / martindale , so 3 fail safes and I have proved dead this way for over 20 years now.
If all 3 fail me then so be it....
However if the Scams insist on a proving unit for the site visit then I would buy a cheap one for assessment day to 'tick the box'
If all 3 fail me then so be it....
However if the Scams insist on a proving unit for the site visit then I would buy a cheap one for assessment day to 'tick the box'