Based upon the USAF's original AMPTEC 620UKB Bonding Milliohmmeter, the new enhanced AMPTEC 620UKB Safety Bonding Milliohmmeter just got better. It measures 10X lower bond resistance levels with even great accuracy. It measures very low resistance bonds that are less than 1 milliohm (on the Lockheed Martin F-35 Tiger Shark). With it's direct digital display in milliohms (to 0.01 milliohms) such operators errors as mistaking ohms for milliohms are prevented. The new enhanced capabilities are on AMPTEC 620UKB's with serial #1000 up.