ph/OTO test kit help

[waterbear]

Taylor has different pH reagents for different comparators. The OTO/pH two way tester has a small pH sample tube and uses reagent R-0014. If you new kit is K-2000 series kit with the 44 ml sample tube for pH tests then it uses reagent R-0004. The two are not interchangeable and will give incorrect readings if used in the wrong comparator.

Edit: Ben's pH/OTO tester is a rebranded Taylor K-1000. Leslie's kits are rebranded Taylor kits also. If you got the DPD Service complete kit or the DPD Complete kit it's a Taylor K-2005 (only difference is the size of the reagents included), if it's the FAS-DPD kit it's a K-2006. Both these kits use the R-0004 pH reagent. All the other Leslie's kits I have seen use the 1000 series comparator block and the R-0014 pH reagent (DPD deluxe, DPD basic, and OTO basic).