Wooden Test Tube Support, 13-Place Material_Borosilicate Glass safely grounding accumulated static charge

safely grounding accumulated static charge during high-voltage demonstration work

10-inch vacuum pump plate on an aluminum base with a stopcock and rubber seal

the wider working face giving longer beam paths for clear refraction-angle measurements

5V flash-lamp bulbs in student-built circuits and small-scale optics demonstrations

the elongated triangular body fitting wider-beam refraction setups and class-front dispersion demonstrations

Wooden Test Tube Support, 13-Place Material_Borosilicate Glass safely grounding accumulated static chargeThirteen place hardwood test tube rack combining seven 19 mm holes and six 25 mm holes with six draining pins for mixed size tube storage in student laboratories.