API Freshwater Master Test Kit RH296 Kitchen Knives Designed with convenience in mind Product Eden Rectangular Corner Designed with convenience in mind Four legs provide stability for secure use The FRESHWATER MASTER TEST KIT is highly accurate and economical and includes a computer calibrated laminated color card 4 test tubes and holding tray Benefits: Tests pH High Range pH Ammonia Nitrite & Nitrate Scientifically accurate for professional results Follow API Easy Care Guide and use the FRESHWATER MASTER TEST KIT: During Regular Care When addressing Water Problem Solving issues Taking a few minutes each week to maintain and monitor aquarium conditions is the key to a healthy aquarium