Just a caveat:

If your kit is the "DPD" kit, using the "DPD" test for chlorine, you cannot use the dilution method--that only works on the OTO chlorine test.

But the good news is if you can find an OTO kit that measures to 5ppm (and they are around although most are only good to 3ppm) you can use dilution with that--and they aren't expensive. You CAN use dilution with a 3ppm kit, but you have to dilute the pool water with 4 parts of distilled water to measure to 15ppm. With a 5ppm OTO kit you only need to dilute with 2 parts of distilled water to get to 15ppm--far more precise.