The Casella CEL-62x series includes sound level meters that meet both the American (ANSI Type 1 and Type 2) and International (IEC Class 1 and 2) standards for accuracy. You can get these meters from BSRIA Instrument Solutions in four different sets, depending on what you need. They're great for checking noise levels at work or for more detailed industrial health checks where you need to pick the right ear protection based on different sounds. Each set comes with the CEL-120 acoustic calibrator to make sure your readings are accurate, a protective case, a microphone cover to reduce wind noise, a USB cable for connecting to computers, instruction manuals, and Casella's own Insight Data Management Software to help you keep track of and analyze your noise measurements.