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The Triplett 3550 SoniChek PRO is a professional sound level metre designed to be used in industrial applications where ANSI standards are called for. This highly accurate metre was designed according to IEC651 Type 2 and ANSI S1.4 Type 2 standards. Its large backlit display and A/C weighting make it an ideal choice for any installer. The SoniChek PRO is well suited for a variety of commercial and residential applications such as fire alarm home theatre plant maintenance HVAC installations and more. SoniChek PRO professional sound level metre set of AC/DC output leads AA batteries 4 USB cable soft carrying case instruction manual and Certificate of Traceability to NIST. NIST traceable calibration ensures the measurement performance and accuracy of a test instrument. It certifies that the calibrated device can be traced back with documentation to National Institute of Standards and Technology NIST standards. Companies that are trying to meet ISO standards typically require products that are NIST certified for proof that the product meets or exceeds the specified accuracy.