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Let me start by saying that I don't know if this is the right place to post this, but if not here then I don't know where else.

I have purchased both the tinySA ULTRA and the nanoVNA H4 from Mirfield Electronics and couldn't be more pleased with the service that I received both times.
Martin Stokes G3ZXZ is one of the nicest and most informative people that I have ever dealt with. The service he provides is second to none and I would suggest that everyone in the UK uses him.
I am not affiliated or being paid to post this in any way. I am just a very happy customer and service like he has provided me needs to be recognised in some way and this was the only way that I could think of doing it.

His website is

Thank you again Martin.
I do hope that you are on here and see this.

All the best
Paul

Here is the update as promised,
Please note that as this was only a proof of concept, I didn't worry too much about getting the screen protector to exactly the right size. My thinking was that if it wasn't going to work atleast reasonably well, then what's the point of spending too much time getting the exact size. (More about that later).

First I decided to just get the cheapest film type screen protectors that I could find on Amazon with next day delivery. This turned out to be a pack of 3 for the iPad mini 6th generation, costing less than ?4. Looking at sizes, this would mean that I would have 12 attempts to get the size correct and apply without bubbles.
I carefully measured the screen aperture using my vernier calipers, thinking that with my OCD there was no way that I could live with huge gaps. But this was just a test so I can live with gaps for the purposes of testing.

Anyway, Piece cut out very nearly my intended size. Not as close as I would have liked but good enough for the test. Screen cleaned (what I thought was adequately enough), I applied the test protector and got one just one small bubble due to a piece of dust I missed. Good enough for now, but I cannot have a bubble in the final version if this even works at all.

I fired up the tinySA Ultra fully expecting this to be a complete disaster and to my surprise the difference was basically imperseptible to having just the wrinkled default manufacturing protection. If anything, it was better with my bodged up test.

I will add a couple of bad photos at the end.


Spurred on by this success, I decided to do the same to my new NanoVNA-H4. I was a little rushed, so whilst applying the screen protector test piece it slid under the edge of the case by 2-3mm. Rather than take it out and starting again I decided to leave it as it would show me how accurate I needed? to be on size, or if I could removve the case, cut to the full screen size and then fit the case again. This would essentially make the screen protector invisible, if it woked.

As before with the tinySA, the NanoVNA-H4 performed with no perceptible degredation in touch sensitivity. Even more surprisingly the fact that the screen protector was between the screen and the case made no difference at all.

I will add a couple of bad photos of this at the end as well.

My next tests will be cutting the screen protectors to the full size of the screens so that there are no edges visible at all as they will be covered by the case completely.

Appologies for the image quality on these but I don't know if there are file size restrictions on images, but these images show my initial test versions and the fact that all funtions can still be controlled as they can without anything.
I have circled the small dust bubbles and arrows showing where I had obviously slid the screen protector too far to the left and under the case leaving a gap where the arrows are. Also sorry about the glare, but I didn't think about things like that when I took the pictures.