# NDT Nation > Radiography & Weld Inspection Canonical page: [https://chrome-stats.com/d/id6808320392](https://chrome-stats.com/d/id6808320392) ## Overview - **ID:** `id6808320392` - **Platform:** Apple - **Type:** Apple app - **Status:** Available - **Publisher:** Marcus Cook - **Category:** Utilities - **Version:** 2.0.2 - **Last updated:** 2026-09-16 - **First published:** 2026-09-12 - **Size:** 6.56 MB - **Data as of:** 2026-09-22 - **Store listing:** [Apple App Store](https://apps.apple.com/us/app/ndt-nation/id6808320392) - **Website:** [https://primeinspections.com](https://primeinspections.com/) - **Privacy policy:** [https://ndt-fieldcalc.vercel.app/privacy.html](https://ndt-fieldcalc.vercel.app/privacy.html) ## Description Now 60 verified calculators, a full standards reference library and 750 exam questions — offline, in your pocket. NDT Nation is the field reference built by RT people, for RT people: 60 verified calculators, a standards reference library and three full exam-prep banks — all working offline at the shot location. 60 CALCULATORS • RT — film density by code, R-factors, source decay, exposure correction, geometric unsharpness, boundary estimate, blow factor, wall shot selector, IQI/density check, % sensitivity, HVL attenuation, inverse-square, isotope reference, film development, pipe schedule • UT / PAUT / TOFD — wavelength, near field, beam spread, Snell's law, angle-beam path, dB/amplitude, attenuation correction, thickness by echo, temperature correction, scan calculator, DAC/TCG helper, wedge refraction, TOFD setup • MT — coil shot, prod current, yoke lift test, demagnetization check • ET — depth of penetration, fill factor, phase/impedance, limit frequency • PT / VT — dwell time and dwell grid, lighting, coverage check • Welding — heat input, fillet weld size, pipe hi-lo, weld symbols, preheat/interpass, PWHT time and temperature, undercut acceptance, camber • Materials — carbon equivalent, bolt torque, weld volume, pipe clock position, F#/P# reference, hardness conversion, alloy/PMI reference, unit and temperature conversion ACCEPTANCE CRITERIA + INDICATION EVALUATION Pick the code, edition, pipe size and wall thickness and get the tolerance for each anomaly type computed for your actual wall — with a real reference radiograph on the rows that have one. The API 1104 engine evaluates an indication against the individual-length, worst-12-inch aggregate and percent-of-weld-length tests and tells you which one it fails. FILM INTERPRETATION WITH REAL RADIOGRAPHS Ten defect categories — incomplete penetration, IP due to high-low, elongated slag, porosity, cracks, burn through, hollow bead, internal and external undercut, incomplete fusion — each with real annotated films you can pinch-zoom, plus what it looks like on film and how it is graded. REFERENCE LIBRARY API 510, API 570, API 653, API 571 damage mechanisms, WPS/PQR to ASME IX, PT and UT code guides, PMI guide, CUI/coating and electrode storage — written in our own words from the governing standards and cited, never copied. EXAM PREP — 750 QUESTIONS • State card / radiation safety — 200 questions plus study notes and a timed mock on the real blueprint • CWI — 351 questions plus bullet study cards • ASNT Level II — 199 questions across UT, RT, MT, PT and ET Every answer comes with the explanation and the standard behind it. BUILT FOR THE FIELD • Fully offline — no signal needed at the shot • Big-screen mode: mirror your phone to a TV or monitor over AirPlay or HDMI for a film-density readout the whole crew can read across the bay • Customizable home — pin the tools you use, most-used surface automatically • Dark, one-hand interface that reads in bright sun or a dark bay Every formula is built from the governing standard — ASME, API, AWS, ASTM, ASNT, NCRP — and cited, not copied from another app. Reference only. This app does not replace your governing code, your written procedure or certified personnel. Radiation safety outputs are planning aids: always verify with a calibrated survey meter and follow your radiation safety program. ## Rankings - #2,194,314 — Overall ## Similar extensions and apps - [RT Calculator: Gamma NDT](https://chrome-stats.com/d/id6776261575) - [Fox RT Guide](https://chrome-stats.com/d/id6761904066) - [NDT X-ray Toolbox](https://chrome-stats.com/d/id1291387260) — 5.00 / 5 - [Euler Gamma: NDT Calculator](https://chrome-stats.com/d/id6772123721) - [Gamma Pro: NDT Radiography](https://chrome-stats.com/d/id6771815436) - [Gamma Calculator Pro](https://chrome-stats.com/d/id867478383) — 3.60 / 5 - [RT Helper](https://chrome-stats.com/d/id6755742319) - [Film Exposure Calculator](https://chrome-stats.com/d/id1549189813) - [NDT Master: UT Calculator](https://chrome-stats.com/d/id6762549446) - [RadAegis: Radiation Safety](https://chrome-stats.com/d/id6761738603) — 5.00 / 5 - [RadTool](https://chrome-stats.com/d/id6747630748) - [Nuclear Med Suite](https://chrome-stats.com/d/id6762461720) --- Source: [Chrome-Stats](https://chrome-stats.com/d/id6808320392)