Virginia Tech, Extension Service2019-11-082019-11-081940-03-17http://hdl.handle.net/10919/95332Photometer used by physics department in solution concentration determinations - tap openpositive, 4 x 5 in.image/jpegIn CopyrightApplied ScienceAgricultureVirginia Extension - Project 10Agricultural EngineeringLaboratoryField Projects and DemonstrationsOther InitiativesPhotographBiological Systems Engineering, Virginia Tech