Immerse strip. Swirl 2 times. Remove with pads face up. DO NOT SHAKE OFF EXCESS WATER. Immediately read TH, Alk and pH wait 30 seconds to read NO2 and NO3.For best results:Keep wet fingers out of the vialRead in natural lightClose vial tightly after removing stripStore in cool, dry place
PETCO 5-Way Aquarium Water Test Strips
Pack Size: Pack of 25