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The Triplett 3550 SoniChek PRO is a professional sound level meter designed to be used in industrial applications where ANSI standards are called for. This highly accurate meter was designed according to IEC651 Type 2 and ANSI S1.4 Type 2 standards and with its large backlit display A/C weighting and makes it the perfect choice for any installer. Overall the SoniChek PRO is well suited for a variety of commercial and residential applications such as fire alarm home theater plant maintenance HVAC installations and more. Founded in 1904 U.S.-based Triplett Test Equipment continues to be on the leading edge of specialized testers. Whether supplying vital test equipment to the U.S. Signal Corps during WWII or providing the railroad industry with essential testers to ensure the safety of their crews and the public Triplett prides itself in developing innovative reliable and durable test equipment for every technician–that also won’t break the bank.