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I timed the shut off window for the ULR Checker at close to three minutes. Dissolution of the reagent takes about one minute. You might find using a blank will give an incorrect zero no matter how hard you try.
One solution for quickly getting the reagent into the test vial is to open the reagent packet before you start zeroing as someone has already suggested. To speed up the addition of the reagent to the vial, use a small funnel or what I do is to dump the reagent onto a two inch square of wax paper. When it is time to add the reagent, I pick up the opposite sides of the square to form a narrow "trough" and pour in the powder, tapping gently to get the powder flowing. I have gotten the time down to about 1.5 minutes for reagent addition plus one minute of shaking to dissolve the reagent.
I found the procedure a little fussy and the shut off window a bit tight, but oversll I like the Checker.
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