Wooden Test Tube Support with Draining Pins, 6-Place Science at Home Long-focal double-convex glass lens at

Long-focal double-convex glass lens at 75mm diameter and 500mm focal length

and stirrer for thermal-mixing measurements of specific heat and heat of reaction

Pivoted needle-style electroscope that swings on its axis when a charge is applied

Pairs 50mm of aperture with a 200mm focal length on a convex glass surface

25-inch gear train simple-machine model arrives ready to use with no assembly required

Wooden Test Tube Support with Draining Pins, 6-Place Science at Home Long-focal double-convex glass lens atDraining pins paired with a turned post hardwood frame give this six place test tube support inverted drying plus upright storage for tubes up to 19 mm across.