Taylor K-1004 Trouble Shooter Test Kit The 3-WAY and 6-WAY kits offer a choice of N,N-diethyl-pphenylenediamine (DPD) or orthotolidine (OTO) for determining sanitizer residuals. The 9-WAY kit uses the DPD method exclusively and includes tests for calcium hardness and the stabilizer level in water treated with cyanuric acid, pool/spa dosage charts, and a copy of I Never Liked Chemistry. This booklet uses illustrations and simple vocabulary to turn a complex subject into one that is easy to understand. Features and Benefits Tests for Free and Total Chlorine, Bromine, pH, Acid/Base Demand and Alkalinity Features hard shell case, easy to read compartor and 3/4 oz reagents