Extech SL130W: Sound Level Alert with Alarm

Key Features:

Continuous sound-level monitoring (30–130 dB range): Supports three selectable measuring bands — 30-80 dB, 60-110 dB, and 80-130 dB — covering quiet to very loud environments.

User-configurable high/low sound thresholds: Lets you set a sound limit anywhere from 30 dB up to 130 dB. When the sound crosses the preset high or low limit, the unit triggers an alert.

Visual alerts with bright LEDs visible up to 30 m (100 ft): Red and green LEDs flash to indicate if sound is too high or (optionally) too low — very suitable for classrooms, auditoriums, hospitals, industrial areas, or “quiet zones.”

External relay output for alarm or signage integration: The alarm output (3.5 mm mono plug) can drive an external relay module — for example, to activate a “QUIET” sign or other remote indicator.

Flexible mounting / placement options: Built-in mounts allow for wall, desk, or tripod installation; plus the microphone rotates 180°, and an optional 5 m (15 ft) extension cable enables remote-mic positioning.

Compliance with sound-meter standards: Meets ANSI Type 2 and EN 60651 standards — compliant with relevant safety and occupational noise regulations (e.g. OSHA) for reliable measurements.

Professional measurement specs: 31.5 Hz–8 kHz frequency bandwidth, selectable A or C weighting, response times (Fast: 125 ms / Slow: 1 s), and 0.1 dB resolution — delivering accurate and responsive sound level readings.

Versatile power options: Works with 100–240 V AC adaptor for full function (including LEDs), or with 8× AA batteries for basic monitoring — useful where wiring or outlets are inconvenient.