All this stuff prompted me to dig and try to resuscitate the Satlink 6906 I bought last year, but never really got the hang of - and I also remembered that people complained of the screen reflections issues, which is true for both meters.
I think the "solution" might be a tinted phone screen protector (the screen is about 3.5" across the diagonal), or a camera LCD display "collapsible screen shade" and so I've just ordered one of
these from China for £2.99 - it's not
quite large enough to cover the meter screen, but probably good enough to see most of what is needed.