I own a reef tank and I use these kind of tool to take measurement of the water: Hanna Instruments. I have been using them for 3 months now and they work great. No color guessing.
My question is are they any good to be used in a pool also? I know a lot of you guys will say "go with TF-100 kit" because you want to promote it. But I already have one and I love it, but the color guessing sometimes give me a headache .
Anyone been using this instruments? Or any other similar one?
Here is the link to pool&spas: Hanna Pool & Spa Meters
Here is more advanced unit: Hanna Multiparameter For Pools . It cost over $500 but if it works good then I'm willing to spend that kind of money