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Oh and I have a not brilliant sound meter and light meter on the phone too. Also an audio function generator and an audio spectrum analyser. Buy a phone with a 3.5mm jack.
All on the playstore. You do have to experiment to find ones written by engineers (no adverts or servers or spyware) and that work on your phone. Only some phones have the ambient light sensor.
Also a barcode scanner that simply displays the content and can optionally paste it to a Firefox tab or Jota text editor.
VLC and DosBox of course. These are sorts of things (apart from spirit level and light meter) I've had on laptops as free utilities for nearly 20 years. Well, I had to buy an actual barcode scanner, though I added a bought barcode recognition library to the VB program I wrote using Twain to capture documents for indexing in the Document Archival system I wrote in 2003/2004.
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