Watch & Discuss the Air Arms s510 XS Ultimate Sporter Laminate .25

Steve...great review and really sharp gun. I was a little confused by the digital read-out in front of the chronograph display. I have watched many of your reviews and it did not appear to be a decibel level being displayed (based upon a the lack of correlation between the sound, firing and change in volume compared to the displayed read out which was generally measuring too low) so what was being displayed? Thanks got another great review.