[Coral-List] Portable, easy to use water testing kits

[Benjamin Cowburn]

Hi,
I'm trying to find an easy and robust way of checking water quality (esp.
nutrients) on a reef. I've found various kits available for aquarists e.g.
this
<http://www.swelluk.com/api-reef-master-test-kit/?gclid=Cj0KEQiA8orFBRCEpODivaOft_EBEiQAy3mlfaDNakIGStWelz_AxX2VOsySHUHEDzzSXMRLR7azNqUaAuMZ8P8HAQ>
..
Are these appropriate for use in the field? Any recommendations or
suggestions of how to do water quality testing, without a dedicated lab
would be welcome!
Cheers,
Benjamin Cowburn