SDi SM50 Universal and Easy-To-Use Speech Intelligibility Tester for Fire Safety Systems

Ensure your life-safety and security communications are heard when it matters most with the SDi Fire SM50 speech intelligibility tester. Built as a universal, easy-to-use tool for fire safety systems, the SM50 speeds commissioning, verification and routine monitoring of voice alarm and public address installations. The 3.2” full-color touchscreen and compact form factor let technicians perform STIPA and full STI measurements quickly on-site, while RTA, FFT and reverberation time functions provide deeper acoustic diagnostics to troubleshoot intelligibility issues. With 4 GB internal storage, built-in USB connectivity for fast data offload and compatibility with Type 2 / Class 2 or 48 V XLR measuring microphones, the SM50 supports efficient reporting and regulatory compliance, including NFPA 72 Annex D. Ideal for security, surveillance and facilities teams responsible for fire alarm voice evacuation and PA system performance, the SM50 reduces test time and increases confidence in system performance. Add the SDi Fire SM50 to your toolkit for reliable, standards-based intelligibility testing—order now or contact us for a demo.

• Ensures clear, intelligible voice evacuation and public address messages to improve occupant safety and reduce liability during emergencies
• Intuitive full-color 3.2” touchscreen and rugged hard case streamline on-site commissioning and routine maintenance for security and fire teams
• Performs both STIPA and full STI measurements plus RTA, FFT and reverberation time diagnostics for fast, actionable acoustic analysis
• Built-in USB connectivity and 4 GB internal storage simplify data transfer, reporting and firmware updates for efficient system monitoring
• Compatible with Type 2 / Class 2 and any 48 V XLR measuring microphones, delivering reliable, standards-ready measurements (NFPA 72 Annex D compliant)