Pond Boss Forums INTRO Questions & Observations how do you sample bottom waters?

Actualy I did subscribe, and you sent me 2 issues already. Great and informative magazine, between this forum and the articles in the magazines I'll save alot of wasted efforts in my pond management. Didn't see any advertisers for bottom sampling devices. If I remember back (way back) from my college days they were called Nansen bottles and Van Duren bottles (2 different types) I'd much prefer them because a sample of bottom water can be tested for pH, nitrate, TDS, and many more parameters as well as O2. A probe will only read O2 and I'll have no water to play with. Any idea where I can get these bottles, or whatever they may call the bottles these days?