My color perception seems to be pretty bad, the test results are next to useless for me. Test strips and test bottle kits. I've tried different brands, including API, bright light, white backgrounds, checking expiration, etc. I'm not sure what I'm supposed to do. What are my options? Do they make affordable multimeters? If they don't, which test is most important to know the results of? Ammonia, nitrite or nitrates? I'd also need pH. I bought a pH meter before but couldn't get it to calibrate. Also, apparently they need to keep being recalibrated. Is there a different kind of pH meter that doesn't require that? Any options for the other parameters? I don't do in depth plant nutrient testing, but I like to know my GH and KH in addition to the the aforementioned other parameters. I'm trying to breed fish and grow plants, so anything else useful to that would also be good to know. Thanks for any help. This is a problem I've had for years but seems to be getting worse.