Red Sea makes a convenient Alk, Ca, Mag kit that have similar testing procedures using the titration tool, and everything fits in an included plastic box (that I wish was about 1/2" taller). Highly recommended.
The worst kits are the ones that make you compare your test sample to a strip of colors, like API and SeaChem kits do. Too inaccurate for my tastes.
Hanna Alk checker is the Cadillac of testers. I wish all testers were this easy. (watch out for a bad batch of reagents, though, which is unfortunate.)
Hanna's Calcium tester is my least favorite tester. I can't get consistent results with it and regret the purchase.