I agree with Cecil. If you only need to test water DO at surface a few times a year then strongly consider the inexpensive chemical kits. Deeper waters can be tested for DO with the chemical kits but ideally the water should be collected at the depth desired and without bubbling. Bubbling the water as a jar or collecting bottle fills adds oxygen to it. Collecting deeper water without bubbling the water has to be done with some sort of unique sampler, although it can be relatively simple and inexpensive or more complex and cost $100+.
The meter DO samplers are convienient for depth DO samples and usually pretty accurate, but you pay for that convenience.
Last edited by Bill Cody; 02/07/09 09:44 AM.
