I bought 2 different MRAD113's from eBAY and wanted to test them to ensure they were working. One was a new old stock unit, the other looks almost brand new as well. Both were from back in 2011 or a few years older timeframe. One had a cal sticker on it, but it's been a while since it was verified. Considering what I paid for them vs the Accurad (~$230 each I think, compared to the Accurad which was ~$1000) they are both within spec when testing with a CS-137 source that I just bought. The Accurad is definitely faster to respond is damn awesome, but the MRADs just work - which is awesome!