You can force your OTO kit to read higher with a dilution method. You do lose accuracy with each dilution, but it is better than nothing until your K-2006 arrives.

Testing Without a Good Kit

If your CYA is around 50, you'll want to keep your chlorine level around 15ppm. Go ahead and test it again in the morning and add more bleach to bring it back up to 15. Each gallon will add approximately 2ppm. You can use that as a reference to help you figure out how much to add when you test. You can test as often as you have time for but at least twice per day and each time, take the chlorine back up to 15.

Run your pump 24/7 while you are working to clear this up but leave your SWCG off.

Hopefully, you'll see a big improvement in the morning.