JBL ProAquaTest Combi Set Pond: valuable complete water test kit for a simple and save controlle of all important values in your aquarium biotope. JBL ProAquaTest Combi Set Pond contains 6 different tests for the most important water values in the garden pond.+ pH (3-10)+ Ammonium NH4+ Carbonate hardness KH (CH)+ General hardness GH+ Nitrite NO2+ Phosphate PO4 Koi+ with laboratory compensation system compensates water discoloration+ includes syringe to measure amount of water+ water-resistant plastic case+ contains tables for recording results+ each test is available as refill pack