I recently bought some XTX2500's. 2 UHF, & 2 900's. Both UHF radios were ex military, & they wanted the low power settings to be 1/2 watt, even though spec was 2 watts. So when I brought the radios to my friend's shop, & ran them on the Aeroflex, they both failed at the low power setting. The Aeroflex then set the low power settings to 2 watts, automatically w/o having to do anything. The 1st 900 radio was OK, but 600Hz high, so the 3920 retuned it automatically, & it was then 6 Hz high. But the 2nd one could not get into repeaters, although 927 rx/tx was fine. Ran it on the 3920, & it turned out the dev/bal was 7% out of spec on repeater input freq's. Again the Aeroflex corrected, & retuned the radio to spec. So there was no manual tuning involved. Just push a button, & the radio reads the specs, & retunes if necessary. It even printed out a report of all the specs. Pass, fail, & retune. Like a report card for the radio.