I’ve owned both an analog and a digital refractometer and they both have their place. I prefer the digital for most of my checks. Mine is the Presidium model. With the digital, there is calibrations you need to do once in a while so you need to keep a few known stones on hand. If you live anywhere near York, PA, USA we could meet and you could try mine out. You’ll never identify all your stones with just two tools, but you can get a lot of them. Since you have a scale, it can be used for specific gravity tests without buying more equipment. I think most of the other tools may also be hard to use with eyesight issues. Spectrometers and Dichroscopes both have you looking through small tubes. A UV flashlight is a cheap investment that can help ID too. You can find them under $5 on ebay.
Duane