Zener Diode Unit Racks & Stands_Flask Stands with a captive thumbscrew on

with a captive thumbscrew on one prong for Melde's standing-wave experiment and binding posts accepting 2-6V DC

this metal-base board tensions six 1-meter wires side by side with 4mm socket terminals at each end

tapered spout

Four vinyl-coated prongs grip flasks and burettes up to 4

supplying two voltmeter scales on one accessory so students switch between low and mid-cell voltages without rewiring

Zener Diode Unit Racks & Stands_Flask Stands with a captive thumbscrew onMounted Zener diode on a transparent base with 4mm color coded sockets and a printed circuit diagram, available in voltage ratings from 2. 7V to 24V for breakdown region demonstrations.