IH/OH Toolbox: Pro Instruments

The most comprehensive industrial hygiene and occupational health app ever built. 35+ professional tools — instruments, calculators, references, and certification exam prep — designed by a CIH/CSP with 25+ years of field experience. Everything you need for workplace safety, right on your iPhone or iPad.

MEASUREMENT INSTRUMENTS
Turn your device into a field-ready toolkit. Sound Level Meter captures real-time noise with A-weighting and TWA tracking. Light Meter uses your rear camera for calibrated lux and foot-candle readings. Anemometer estimates air velocity via microphone or Bluetooth. Vibration Meter assesses hand-arm and whole-body exposure. WBGT Heat Stress integrates live weather data with work/rest calculations. UV Toolkit estimates ultraviolet exposure and risk. Cold Stress calculates wind chill and frostbite thresholds. Noise Contour visualizes sound exposure mapping across work areas. Pressure Differential supports negative pressure verification for containment rooms.

PROFESSIONAL CALCULATORS
IH Equation Solver puts dozens of essential industrial hygiene formulas at your fingertips. Chemical Mixture OEL Calculator determines additive effects using TLV mixture formulas. Air Sampling Planner designs monitoring strategies with proper durations and flow rates. Ventilation Rate Calculator computes required exhaust and dilution airflow. NIOSH Lifting Equation calculates recommended weight limits for manual handling tasks. Fall Clearance Calculator determines minimum distances for fall arrest systems. Ergonomic Screening performs RULA and REBA assessments. Spill Volume Estimator models chemical release quantities for emergency response. Cartridge Life estimates respirator changeout schedules. Confined Space monitors oxygen, LEL, and toxic gas levels. Hazard Assessment screens and prioritizes workplace health risks. Ladder Selector determines proper height and type. Full scientific calculator and unit converter included.

REFERENCE LIBRARY
Access critical safety data offline. OEL Selector searches occupational exposure limits across 10+ jurisdictions — OSHA PELs, NIOSH RELs, Cal/OSHA PELs, plus standards from the UK, Australia, New Zealand, Canada, Singapore, and South Korea. Respiratory Protection Guide covers respirator selection and assigned protection factors. Chemical Storage Categorizer checks compatibility and segregation requirements. Fire E