ATP-ET-933-Manual-or-Auto-Range-Sound-Level-Meter-ATP-ET-933-P-The-ATP-ET-933-is-a-Manual-or-Auto-Range-Sound-Level-Meter-that-is-ideal-for-measuring-noise-levels-in-different-environments-&-industries-Manufactured-to-IEC-60651-Type-2-this-sound-level-meter-has-a-precision-frac 12-electret-condenser-microphone-&-is-lightweight-&-easy-to-use-P-ATP-ET-933-Manual-or-Auto-Range-Sound-Level-Meter