We have and use test kits from various different manufacturers, from the cheapest to the more expensive, their results can different to some degree in accuracy and ease of use depending on the methods used for each.

Just keep in mind all 'hobby grade' kits are all pretty subjective to a lot of variation in results. Think that if everyone found a source for some professional grade kits that were affordable enough to aquire and use it would open a lot of eyes and start a mass panic... likely our parameters would be WAY off their detection scales, most designed to read in .01 parts per TRILLION!


Armed with that information, just do your best to provide your captive animals with the best environment possible, but keep in mind this is a hobby and should be 'enjoyable'.