Start with the simple ones. Basic strength tests - lift different weights to determine if you are any stronger after wearing the pendant. Basic speed tests - run on a treadmill and see if the pendant allows you to run any faster. Menstrual pains - you need a female friend here. The next time she has her menses, have her try out the pendant and see if it really helps her relieve the pain / cramps. Lowers temperature in the fridge - Pretty easy to measure. Check the temperature inside the fridge, chuck the pendant in and see if it really makes the temperature drop. There are plenty of other tests we can do, but those are the basic ones I would love to test.