Superior Wooden Test Tube Support, 12-Place Entomology & Zoology_Entomology Supplies Designed to make electric field

Designed to make electric field lines visible

tendon attachments

plano-convex

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

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

Superior Wooden Test Tube Support, 12-Place Entomology & Zoology_Entomology Supplies Designed to make electric fieldTwelve 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.