ICP Water Analysis kit
If you'd like to get professional lab analysis of your aquarium water, ICP-analysis.com offers this service. Fill the vial with water, tag and seal it, place it back in the box and mail it in. You will receive an email notifying you when your results have been posted on their website. It's that easy!
Read my blog entry to find out what I learned when I had my water tested: http://www.melevsreef.com/blog/icp-test-results-have-arrived