Bell in Vacuum, Glass, DC Subcategory_Lab Burner Accessories Six-range AC/DC moving-coil voltmeter at

Six-range AC/DC moving-coil voltmeter at 3/10/30/100/300/500V with a toggle for AC or DC mode

Larger-spark 100mm induction coil from a 6-12V DC input with adjustable vibrator and base-mounted suppression capacitors

Air-cooled rheostat with extended-tube ventilation

Pack of 5 rubber pipette bulbs in 5mL capacity provides suction control for precise volumetric transfer and pipetting in laboratory applications

Bell in Vacuum, Glass, DC Subcategory_Lab Burner Accessories Six-range AC/DC moving-coil voltmeter atBell in vacuum jar with a 4 6V electric bell suspended on rubber cord inside a 22 by 15cm glass chamber, illustrating that sound cannot travel without air.