Extech 407744 94 dB Sound Level Calibrator - 1 kHz Sine Wave for 0.5″ & 1″ Mics, ±0.5 dB Accuracy, Rugged Aluminum Housing, Battery-Test LED, IEC 60942 Certified

From the Manufacturer 1kHz 94dB professional sound calibrator for 0.5" or 1.0" microphones calibrates and verifies sound level meter operation. Battery test position with battery status LED indicates if battery is good. Durable die-cast aluminum housing generates a 1kHz sine wave at 94dB to an accuracy of 5% (frequency) and ±0.5dB (94dB). Meets IEC standard 60942 1997-11and comes complete with two 9V batteries, carrying case, and screwdriver.

• Precision Calibration - Generates a 94 dB sine wave at 1 kHz (±0.5 dB accuracy, ±5 % frequency) to ensure sound level meters read accurately.
• Solid & Durable Design - Built with a die-cast aluminum housing that's rugged enough for field, industrial, or lab use.
• Built-in Battery Status Check - Slide to "Battery Test" to see if your 9V batteries are good via the status LED, ensuring calibration is always reliable.
• Universal Microphone Compatibility - Works with 0.5″ or 1″ microphones, making it ideal for professionals and hobbyists alike
• Complete Calibration Kit - Includes two 9V batteries, screwdriver, and carrying case—everything needed for convenient setup and use.