Without instructional materials to engage our students, science teaching and learning would come to a screeching halt. They are the folks who work behind the scenes to make every unit "new" when it arrives in your classroom. Please be considerate and re-package the materials with care -- and they should come back used, but not abused.
Our techs do their best to conserve materials and refurbish these units well. Messes (see photo) take a long time to clean and usually means some materials are damaged. We hope you understand that taking a few careful moments when preparing to return the unit can help keep costs down and keep our techs safe!