The Triplett 3550 SoniChek PRO Professional Sound Level Meter is the ideal tool for industrial applications where ANSI standards are called for checking noise levels. This highly accurate meter 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. 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.