I've seen the grey grid containers used in research for this purpose. http://www.usplastic.com/catalog/default.aspx?catid=537&parentcatid=845
I'm not affiliated with this company, this is just where I've seen them for sale. Michael Manna Environmental Scientist Everglades Systems Assessment (ESA) Section - 4350 South Florida Water Management District 8894 Belvedere Rd. West Palm Beach, FL. 33411 Office: (561) 753-2400 x 4578 Cell: (561) 312-7426 Email: [email protected] We value your opinion. Please take a few minutes to share your comments on the service you received from the District by clicking on this link<http://my.sfwmd.gov/portal/page/portal/pg_grp_surveysystem/survey%20ext?pid=1653>.
