For a chlorine neutralizer I have always had excellent results with Amquel or Amquel+ by Kordon which also treat the ammonia. However if you add bleach first, just like shocking a pool, and aerate then you are driving off the ammona as nitorgen gas and a simple thiosulfate chlorine remover will then do the job.
The API Freshwater Master Lab test both low and high range pH, nitrite, nitrate, and ammonia so it's a good start. If you need other tests you can add on what you need.. For copper I would spend the moneh on one of the low range kits from LaMotte or Taylor.