I've got the Seachem Reef Status Magnesium test kit, bought from J&L Aquatics in BC (have an online store). I'm not real impressed with the kit, it was somewhat spendy, is a PITA to do a test, and not particularly accurate. Repeatable, but not accurate. Either that or the referance solution they included was way off. Either way I had to create a factor of about 15% to add to my measured reanding in order to get the actual reading. BUT, it is working despite the drawbacks... I know you mentioned Edmonton area, but J&L ships pretty quick.
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