By Taylor’s own say-so, the block is a guesstimate. I forget now the exacts # but it was something like that at 1 ppm it was reliable to +\- .5 and at 2 ppm it was +/- 1. They have no reliability at all for 3+, again per Taylor.My daily comparator block is what is off the scale
So it’s a liquid version of a test strip. You’re pretty sure you have 7FC left from yesterday ? The block will be really yellow and that’s close enough to know you have plenty of wiggle room until hitting minimum. It’s great for spot checks in that scenario. If you can read 3 or less, you need LC, and now.