Test water close to the middle of the tub at about elbow deep.
Store your test strips in a cool dry place and do not let them get damp.
The accuracy of the readings will deteriorate quickly after the use-by date printed on the pot, so always check that the test strips are in-date prior to use.
Insta-TEST 4 Plus Chlorine / Bromine Test Strips are formulated specifically for hot tub use and suitable for use with all chlorine and bromine based sanitisers.
The Insta-TEST 4 Plus pool & spa strip measures Free Chlorine 0-10 ppm, Bromine 0-20 ppm, Total Alkalinity 0-240 ppm pH 6.2-9.0. and Total Hardness
50 strips per pot.More Information