Extech-SDL600-Data-Logging-Sound-Level-Meter-EXTECH-SDL600-p-The-Extech-SDL600-data-logging-sound-level-meter-records-data-on-an-SD-card-in-Microsoft-Excel-reg-format-for-easy-transfer-to-a-PC-for-analysis-The-user-can-manually-store-99-readings-or-set-the-logger-to-automatically-store-up-to-20M-samples-with-date-&-time-stamp-at-a-user-selected-sample-rate-Its-high-accuracy-of-plusmn-1-4d B-meets-ANSI-&-IEC-61672-1-type-2-standards-over-a-range-of-30-to-130d B-with-auto-or-manual-rangi