Extech 407744 94dB Sound Calibrator

Key Features:

Precise single‑level calibration at 94 dB: Generates a stable 1 kHz sine wave output at 94 dB with high accuracy (± 0.5 dB), allowing sound level meters to be quickly verified and calibrated.

Low distortion output (THD < 2%): Ensures clean calibration signal with minimal distortion — critical for accurate microphone calibration and reliable SPL measurements.

Compatible with standard microphones (0.5″ or 1.0″): Designed to work with most handheld or laboratory sound level meters using ½‑inch or 1‑inch microphones — flexible for various measurement tools.

Rugged, field‑ready build: Durable die‑cast aluminum housing makes it suitable for both lab and field use — offering long‑term reliability under industrial or environmental conditions.

Portable and easy to use: Compact size with 2.2″ diameter × 5.6″ length, lightweight (~340 g / 0.75 lb), and simple operation — great for on‑site calibration or quick checks of SPL meters.

Battery-powered with status LED: Operates on two 9 V batteries and includes a battery‑status LED to verify battery health before calibration — ensuring dependable performance.

Compliance with international standard: Meets IEC 60942 (1997‑11) Class 2 standard for sound calibrators — giving you confidence in traceable, standard‑compliant calibration results.

All accessories included for immediate use: Delivered with two 9V batteries, carrying case, screwdriver — ready to calibrate your sound meters right out of the box.

Key Technical Specifications:

Output Sound Pressure Level: 94 dB

Calibration Tone Frequency: 1,000 Hz sine wave

Frequency Accuracy: ± 5% for the 1 kHz output

Level Accuracy (SPL): ± 0.5 dB at 94 dB

Total Harmonic Distortion (THD): < 2% at 94 dB

Compatible Microphone Sizes: 0.5″ or 1.0″ microphones — suitable for most sound level meters.

Operating Temperature Range: 0 °C to 50 °C (32 °F to 122 °F)

Power Supply: Two 9 V alkaline batteries

Power Consumption: Approximately 10 mA DC

Dimensions: 50 × 127 mm (diameter × length) — approx. 2.2″ × 5.6″

Weight: ~340 g (0.75 lbs)

Standard Compliance: Meets IEC 60942 (1997‑11) Class 2 standard — ensures consistent and recognized calibration performance.

Included Accessories: Two 9 V batteries, carrying case, screwdriver, user manual (ready for immediate use).