Each bottle includes 50 test strips packaged in a waterproof pop-top bottle with a hinged cap. The bottle has a bolded desiccant liner, which protects the strips from moisture and UV light. The Insta-TEST 4 Plus strip is ideal for spa owners who need the most critical tests for perfect water balance.

• Free Chlorine 0-10 ppm
• Bromine 0-20 ppm
• Total Alkalinity 0-240 ppm
• pH 6.2-9.0
• Total Hardness 0-800 ppm