Any Aquariums will sell ph testing kits both liquid and digital. It costs more but I'd recommend a digital one as you get a prescise reading. The colour liquid indicators are good but if you've added ferts to water or testing the runoff the water isn't always clear in color so the results can be decieving.
Wobster Reviewed by Wobster on . Drooping leaves, Yellow fans. E-indoor or outdoor - Indoor E-soil, soilless, coco, aero, or hydroponic - Soil CSL-Soil type/brand - ProMix Bx, and Perlite - 2:1 SCL-Anything you have added to the soil - nope SCLR-Soil or slab runoff pH - unknown E-Water source - tap E-Source water pH - unknown E-Age of plant - Clipped a month ago, been in soil for 2-3 weeks E-Type of fertilizer - none E-Rate of application - na Rating: 5