ASTM Narrow Neck Borosilicate Glass Erlenmeyer Flask with Dual Scale Capacity:500mL Class-pack of economy handheld spectroscopes

Class-pack of economy handheld spectroscopes fitted with a rotating slit cap and internal diffraction grating for identifying constituent wavelengths in visible light sources

this simple tangent galvanometer turns Oersted's effect into a quantitative ammeter calibrated against Earth's field

and vas deferens anatomy for reproductive biology teaching

beam redirection

ASTM Narrow Neck Borosilicate Glass Erlenmeyer Flask with Dual Scale Capacity:500mL Class-pack of economy handheld spectroscopesDual scale graduation (ascending and descending) supports both fill and measure and pour and measure reading during routine ASTM compliant volumetric work.