These Aquachek Bromine Test Strips, 50 Strips, help you keep tabs on the water level so you can keep your water feature clear. It's compatible with both pools and hot tubs. Use these Aquachek test strips at least twice a week when it's hot out or when you and your guests spend lots of time out swimming. It comes in your choice of a 1-pack or 2-pack to last you for several months of use. 
Aquachek Red Bromine Test Strips for Pools and Spas, 50 Strips:

• Tests for chlorine and bromine
• Evaluates for elevated or decreased levels of pH
• Tests for total alkalinity
• 50 red pool test strips per bottle
• Comes in a 1-pack or 2-pack
• Check at least twice a week in warm weather or during heavy use
• Compatible with pools and hot tubs for versatile performance