I was using the Poolmaster Kit for the past two years before finding this forum. Thought it was great UNTIL I got a Taylor kit that had the red vial markings. Being new I tried the FC/TC tests with both kits(being anal)several times - each time it was hard to read with the yellow Poolmaster vial but easy with teh red Taylor vial. Short answer to your question - the Poolnmaster never gave a FC reading despite their instructions.

JOhn