Round Polypropylene Test Tube Rack for 12 Mixed Tubes (4 x 25mm + 8 x 19mm) Clearance Speed-controlled 6V motor driving two

Speed-controlled 6V motor driving two cams pumps four spring-mass systems at any chosen frequency

dermal papillae

Simulates kinetic gas theory through an electric motor vibrating a transparent tube of small steel balls

Hand-painted dicot root transverse section model exposes epidermis

supplied in a storage case for student precision work

Round Polypropylene Test Tube Rack for 12 Mixed Tubes (4 x 25mm + 8 x 19mm) Clearance Speed-controlled 6V motor driving twoPolypropylene round test tube rack holding 12 tubes four at 25 mm and eight at 19 mm with 360 degree access for benchtop chemistry demonstrations and student experiments.