Abstract: Individual strips of test tape particularly suitable for urinalysis are held in longitudinal receptacles of a rotating drum and scanned by a measuring device operative to sense light reflecting characteristics of test areas on each test tape. The measuring device is moved along a guide mechanism longitudinally of the drum and the drum is indexed in steps to bring each test tape into sensing position relative to the measuring device. Analytical data from the measuring device may be converted into graphical form by a tracer mechanism operated in response to the measuring device. An endless belt driving mechanism operates to drive the measuring device longitudinally of the drum to scan the test tapes with a lever system containing a switch arm being provided to effect both reciprocal scanning motion of the measuring device and stepped rotation of the drum relative thereto.