1. No need for gloves when handling cuvettes, just give 'em a wipe before inserting into the checker
2. Can you detect color changes? I'm not talking about comparing a shade of pink in a test tube to a different shade of pink shape on a piece of paper. Rather, if you're looking at something and it changes from pink to grey in an instant - can you tell?
3. I'm really happy with my Apex/Trident combo. It's not without it's quirks (and I'm not entirely sold on it's accuracy), but it's precise enough which makes it great for seeing trends -- which is what matters. Don't chase numbers -- get your tank healthy, then record the numbers associated with that and try to stay there. There's also the GHL Ion director and a few other automated testing options.
One thing to note: I wouldn't call the equipment "faulty," you just need to understand the limitations. It's hobbyist grade -- which means it's "good enough." If you're after accurate, precise quantitative data, lab analysis or lab-grade equipment is needed.