Yeah - the one most of us use that Ben sells at the sister site to this forum. www.poolsolutions.com Well worth the money.

In the meantime, you can make your kit test higher by diluting your sample. Mix one part pool water and one part distilled water. Test as usual and then multiply the result by 2. Or, one part pool water, two parts distilled and multiply result by 3, etc. You do lose some accuracy with each dilution, but it is better than nothing. At any rate, think about buying Ben's kit. You won't be sorry.