Superior Wooden Test Tube Support, 12-Place Biology_Botany with side arms bent at

with side arms bent at right angles and formed into jets at their tips

mounted on a rod stand for tabletop reference

Economical minute timer setting intervals up to one hour via a top knob

This is highly useful apparatus for the wave demonstration

Economical slide viewer projects microscope slides as enlarged images for group viewing without requiring a full microscope setup in teaching environments

Superior Wooden Test Tube Support, 12-Place Biology_Botany with side arms bent atTwelve 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.