Noseclip, plastic, foam-padded noseclips help increase the accuracy of spirometry results by eliminating the escape of air through the nostrils during testing
Oersted's Apparatus, demonstrates the action of electric current on a magnet. A cobalt steel needle (75mm long) with agate bearing supported by pivot, mounted on a plastic base and surrounded by rectangular frame fitted with terminals, 0.6 lbs, 8.0x7.5x1.8in