The AMPTEC 620A and the 630 Series Igniter Testers/Failsafe Ohmmeters have become the standard in the Safety Igniter Circuit Test industry, and are designed to provide extremely safe and reliable resistance testing of electrically explosive devices (EEDs) or “current sensitive” blasting devices. Approvals from various Safety Boards include, the U.S. Air Force ( 620A-4) for use on Non-Nuclear munitions provided the appropriate T.O. is available. In addition the US NAVAL ORDNANCE CENTER has approved the AMPTEC 630AN, 630BN and 640N Igniter Testers and other versions are pending. Some of the devices the 620A-4 Failsafe Ohmmeter may be used on include: fuses, squibs, igniters, warheads, explosive bolts, rocket motor squibs, drone parachute squibs, automobile air-bag initiators and many others.