Does anyone use digital water testers?

If so, what brand/model and what do you test?

Specifically I want to test hardness, but I'd really like an "all-in-one" tester. I hate spending time filling up little test tubes and trying to match colors to a master. Nothing ever looks just right.

If you use something for hardness, what units does it measure in?

btw: I'm new to this board, if anyone can point me in a good direction (other sites, for example) I'd really appreciate any help I can get. I've been keeping fish for about 15 years now, and I've recently been making an effort to become more educated and disciplined about the hobby. I've been doing a lot of reading and trying to stay regular with my water changes.

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