ph testing kits for fish tanks can those get out dated

I picked up a pH pen recently Semlos 0. But you could pull the chart off of the bottle and make copies. Hardness is the measure of calcium and magnesium in the water. The back of the box details clear pictorial instructions so you can see what to do from the start. I've done the test several times after I've returned home and I don't show any nitrites yet. Terry, Fantastic job.. Note: the total hardness pad is not used for saltwater tank readings.

PH TESTING KITS FOR FISH TANKS CAN THOSE GET OUT DATED / morphy.info

• Secure and Private
• Easy to Use
• Find Matches Quickly
• Verified Profiles