Well, it is a very cheap BAFX 3370 meter. I'm not quite sure how to check its accuracy, but I did see a YouTube video where they measured the decibel level of two vacuums, one being an Oreck similar to one I own. On the YouTube clip, they measured about 85 dB, but it was hard to tell exactly where the meter was in relation to the vacuum. My meter registered about 83.5 dB for my Oreck, but moving the meter a fairly small amount can change that reading up or down several dB. In any event, based on this, I'm guessing my meter is working reasonably well.@jrtrent: either you have Vulkan hearing ( A Big Bang Theory joke) or there is something wrong with your meter.