Should I get the Phosphurous Checker?

[gregzz4]

There's been a number of posts on this topic lately, but they're hard to find as the spelling between phosphate and phosphorus is all mixed up

I like my Hanna HI 713 phosphate tester, but it takes some getting used to

[Aquattro]

I love mine, wouldn't use anything else. Then again, I tell the temp by looking out the window