If there's chlorine in the pool then it's sort of pointless to add peroxide as the two will simply annihilate one another. Peroxide does not last very long in water and will not maintain a residual level for very long.
If you have a pool store near you that sells Baquacil products, then they may have test strips you can purchase for peroxide. However, just leaving the pool alone for a few days and adding chlorine back in (if this is a chlorine pool) will remove any peroxide.
By the way, peroxide is what caused the pool disaster at the last Olympic Games. The pool operator decided to add peroxide to deal with some high CC levels and the peroxide destroyed all of the chlorine and caused an algae bloom. Swimmers and divers had to use a green pool...
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