Liquid Test kitThe pH TEST & ADJUSTER KIT is a complete kit to measure and modify aquarium water pH to desired levels. Fish and plants require a specific pH level to thrive; however pH in an aquarium can flucuate due to fish waste additon of tap water and the build up of natural acids.Kit contains: 1 x bottle of pH Up 1 x bottle of pH Down 1 x laminated computer callibrated colour card 1 x glass test tube with snap-tight cap and step-by-step instructions on use and information on how to correct unsafe conditions.