hanna checkers

So I see these Hannaford checkers come in high range,low range,no range yatta yatta. Which range would i need for my reef/fish tank? Also would it be beneficial to get all the cal,alk,trate,mag,phosphate,checkers when I hit the lottery or which ones are really worth having? Me and Red Sea don't seem to meet eye to eye on colors so I am checking another avenue...
Thanks Guys