Funny you should ask......

The test you want is the FAS-DPD chlorine test, NOT the regular DPD test.

Ben (PoolDoc) has a test kit that is the ace of the crowd--it measures to 100ppm. You order it over on PoolSolutions.com

Then there's the Taylor 2006 kit that's pretty similar.

Taylor also sells a FAS-DPD kit just tests chlorine--to 50 or 100 ppm

Leslie's, on their web site, has a full kit with the DPD-FAS kit. It's branded Leslie's but made for them by Taylor. They also sometimes have, in their stores, the FAS-DPD kit only.

However, if you have a kit that measures to 5ppm, you can triple the range by the CarlD patented (well, not really) shot glass method. Mix 1 shot of pool water with 2 shots of steam distilled water. Use this mix in your chlorine tester and triple whatever you read--so if you read 5 it's really 15ppm.

BTW, getting advice from WaterMom is better than getting it from me--everyone knows she's nicer!