REED Instruments R8060 Digital Sound Level Meter with Bargraph - Professional Noise Measurement for Home, Office, and Industrial Use

I'm surprised to find that this meter read 10+dB low suddenly after just 2 years. It was rarely used and has been stored carefully. In an attempt to recalibrate it (since the meter itself still looks brand new) I bought a calibrator and followed the instructions. Unfortunately it won't calibrate as the max adjustment is only 3dB and this meter is more than 10dB off!Very disappointed!I'm very pleased with my Reed R8060 Sound Meter. It does exactly what it is designed to do, accurately measure sound levels. If you want to be very accurate you need to buy the Reed R8090 Sound Level Calibrator. My R8060 meter came within specs but I was able to improve its accuracy with the R8090. If you want to be super accurate industry best practice is to calibrate every time you are going to use the sound meter then check the calibration again after taking measurements.The R8060 sound level meter is very easy to use and very accurate. I use it to measure the sound level in a sheet metal manufacturing shop and has help me very much on knowing what areas are louder than others and implement ear plug use for the safety of all employees. I highly recommend this product for any type of environment.Excellent product, would be nice if it had a lanyard strap/ring and if it had something to prevent the windshield from coming off so easily. (Rubber ring at the base?)A complete inconvenience to return a used item when I paid for a new oneWell made meter for the price. Easy to read display. Paired with the Reed calibrator it is a solid set.Worked perfectly out of the box.Needed this thing for a project, no cord to connect to computer!!! what crap! Returning