Just to simplify: If you have the Leslies equivalent of the K-2005 (and, yes, Leslies sells it--it's actually a Taylor re-badged) then all you need is the Taylor K-1515 to "convert" the K2005 to the recommended K-2006. You use the FAS-DPD chlorine test instead of the DPD Chlorine test.

You CAN use the "Patented (j/k) CarlD Shot Glass Method" with an OTO tester like you have to double, triple or even quadruple the reading, using distilled water as you did. However, if you search the forum, you'll find Ben posted another way to use the OTO kit to measure without dilution, with reflecting what it means when the test goes deeper yellow, orange, deep orange, then brown ( I think brown is around 40? ppm?) But you don't get the FC and CC reading, only TC.

BTW, Leslies also sells a re-branded version of the Taylor K-2006 kit.

Carl