The K-2006 kit that Janet encouraged you to buy will read high chlorine levels up to maybe 50? Can't remember. Until you can get the good kit (and I agree that you should), you can force your kit to read higher by using a dilution method. You do lose some accuracy with dilution so it is not meant to replace getting the good kit.
Testing Without a Good Kit
In a 17,200 gallon pool, each quart of plain, unscented 6% bleach will add just about 1ppm of chlorine. Use that as a reference to help you figure out doses of bleach to add. How to keep it at shock level? Test frequently and each time add enough bleach to get it back up to 15ppm.
Hope this helps!
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