Wow, just got my Hanna Checker for alkalinity yesterday and that thing is awesome. Other than them sending me directions with the old powder reagent instructions on it instead of for the liquid reagent (which it came with), it's been perfect. I can't believe I've been messing with titrating and color charts for this long! Anybody with SPS should def own this and the phosphate checker!
On a side note, it was on the spot with my Red Sea Pro Kit for alkalinity, which I had suspicions of reading a bit low. Great news except I've suppressed my alkalinity thinking that the reading has been off.