Vintage US Air Force Ballantine Laboratories

Vintage US Air Force Ballantine Laboratories AN/USM-413 Voltmeter The Vintage US Air Force Ballantine Laboratories AN/USM-413 Voltmeter is a rare collectible item that was used in the military aviation industry. This voltmeter would have been used for measuring electrical voltage in aircraft and transportation systems within the US Air Force. With its historical significance and connection to military aviation, this vintage piece would be a valuable addition to any collection of military aircraft memorabilia. Tested and seems to be working...SOLD AS IS due to the age of the product. VIEW MY OTHER ADS!!!