I've had two Ruolan PH meters. The first worked great for a while and the second not so much. The two PH kits Salifert and API are what I'm currently using. I feel they are OK to get a ballpark reading. I found it real hard to tell between the different colors. I feel I'm running 8.0 to 8.2. My question is what kits or meters are other using? Is there one best kit or meter? Thanks.