I use the Pin Point pH monitor and I use Hagen test kits for most of the rest, EXCEPT magnesium, ammonia and Nitrate, for these I use a Seachem kit.
From what I've read most people like the Salifert and Lamotte, my experience with the Red Sea ones hasn't been favourable, Aquarium systems has been decent though.
One thing with test kits is they do either go flat or expire, I've had pH kits that read a pH of 5 when the water tests out at 7.5 with a friends kit, a new kit verified that mine was useless, so remember to take a sample of your water to the LFS once in a while to verify your test results.
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