Superior Wooden Test Tube Support, 12-Place Entomology & Zoology_Entomology Supplies plano-convex

plano-convex

5-inch plate-and-rod assembly with central mass

Wall-mounted Mason's hygrometer with two identical dual-scale thermometers — one dry and one kept wet via a water reservoir — calculating relative humidity from their paired reading difference

supplying a duplicate-value option for paired-bench experiments on capacitor energy storage

Designed for Bunsen burner support

Superior Wooden Test Tube Support, 12-Place Entomology & Zoology_Entomology Supplies plano-convexTwelve place hardwood test tube rack combining ten 19 mm holes and two 25 mm holes with twelve draining pins for mixed size storage and inverted drying on the bench.