FreqCheck: See Sound/Vibration

* ISO 17025-calibrated spectral engine * 0.2 Hz–192 kHz range, 384 kHz sampling * IEC Z, A & C Frequency Weighting * Fast / Slow Time Integration (SLM) * Native Hardware DC Block * Forensic-sealed, tamper-proof reports * 100% offline, zero-knowledge privacy FreqCheck is the first Class 1 Mobile Lab App — an ISO/IEC 17025-calibrated, NIST-traceable spectral engine powered by IND CORE™ (U.S. Patent No. 12,659,418, Patent Pending 19/660,467) that adapts to your expertise. From 0.2 Hz infrasound to 192 kHz tactical WideBand acoustics — with raw 384.0 kHz sampling. FreqCheck turns your iOS device into an enterprise-grade measurement lab and precision Sound Level Meter (SLM). See Sound and Vibration. Verify therapeutic audio tracks and mystery hums. ENTERPRISE METROLOGY, ONE APP Everyday scanning, raw Pro Input Mode (PIM), Tactical WideBand Metrology, and Dynamic Pulse Sequence (DPS) — all in one certified engine. DC-coupled Line-In connects to pro DAQs and instrumentation mics with zero attenuation, scaling from internal mic to 384.0 kHz captures. PRO INPUT MODE (PIM) Direct control over channel selection, sample rate locks, ADC ceilings, and sensor sensitivity (mV/Pa or mV/g) — bypassing auto-gain and filters. Features standard acoustic SLM lenses: toggle Z-Flat, A-Weighted (human hearing/environmental), and C-Weighted (occupational peak) filters, plus Fast (125ms) and Slow (1s) Time Integration averaging. Switchable Hardware DC Block eliminates electrical offsets from external DC-coupled DAQs while preserving 0.2 Hz infrasound. Presets save hardware profiles and weighting selections for repeatable field precision. TACTICAL WIDEBAND METROLOGY High-frequency acoustic analysis up to 192.0 kHz (384.0 kHz sampling). Dynamic 65,536-point FFT architecture powers enterprise spectral resolution at extreme clock speeds. Includes SPL readouts, live tracking, Peak Hold (Max SPL), and uncompressed telemetry. DYNAMIC PULSE SEQUENCE (DPS) Impulse metrology per MIL-STD-1474E (Z-Flat), OSHA standards (C-Weighted), and comparative suppressor R&D. Isolates and logs extreme peaks via multi-shot logarithmic averaging. Configurable pulse counts (3–10), threshold gates, and lockout windows (0.5–3.0s) deliver exact Peak SPL readings for tactical, industrial, and engineering use. OFFLINE MEDIA AUDITING Import raw video and lossless audio (.wav, .flac, .alac, .aiff, .m4a, .mp3) for offline calibrated analysis — audit media claims, verify sound therapy tracks, and run forensic signal analysis configurable with (PIM). FORENSIC-GRADE PROOF Four-layer security: Metrology Configuration Snapshot (stamping active Z, A, or C weighting and hardware parameters), device-hash anchoring, real-time SHA-256 sealing, and signed PDF Audit Reports. Any tampering breaks the seal. ISO 17025:2017 Calibrated (Cert #05122C9A 2602). ZERO-KNOWLEDGE PRIVACY 100% local, on-device processing via edge computing. No raw audio/video is ever uploaded or stored. Zero data center dependency. Starter: Free, ad-supported *Remove Ads: U$2.99 one-time. **Pro Monthly: U$19.99/mo, 7-day free trial. **Pro Lifetime: U$149.99 one-time. **Pro unlocks the LOGS vault, full PDF Audit Reports, and posting/commenting in the Nyquist Forum. THE MICROSCOPE MOMENT The microscope didn't create bacteria — it revealed what was already there. GPS didn't create your location — it made it knowable. FreqCheck makes the full spectrum visible, measurable, and provable. You don't need a degree. You need one tap. Privacy Policy: freqcheck.com/privacy.html Terms of Use: freqcheck.com/terms.html DISCLAIMER: Metrology tool for research, acoustic consulting, and educational use only. Not for medical diagnosis. Full NIST traceability requires unbroken calibrated external hardware. LICENSE: Valid for technical verification & media analysis. Void for commercial manufacturer certification or packaging claims. © 2025-2026 Abundance Sea, LLC. All Rights Reserved.