How to Become an NDT Technician: Step-by-Step Career Guide

How to Become an NDT Technician

To become an NDT technician, you complete method-specific classroom training (commonly around 40 hours for a Level I course), pass a written and practical exam, log documented on-the-job experience hours under a certified Level II or III, and get certified per ASNT SNT-TC-1A or ISO 9712. No college degree is required — a high school diploma or equivalent plus a passing annual vision test is the actual baseline.

Step 1: Confirm You Meet the Basic Requirements

Before you invest in training, it's worth checking the two requirements that actually gate entry into NDT — and they aren't academic.

No degree required

This is genuinely true, and it's one of the more attractive things about the field: SNT-TC-1A (the ASNT recommended practice that most U.S. employers build their certification programs around) does not require a college degree for Level I or Level II certification. What it requires is documented training hours, documented experience hours, and a passing exam score, all administered by the employer's own Level III under a written practice. A high school diploma or GED is the typical minimum. That said, some employers — particularly larger EPCs, aerospace primes, and nuclear operators — do prefer or require an associate's degree or an NDT trade-school certificate for Level II/III track hires, so "no degree required" means the certification standard doesn't mandate one, not that every employer will hire without one.

Vision requirements are real and non-negotiable

Every NDT candidate must pass an annual vision examination, and it's more specific than a typical eye test. Per SNT-TC-1A, candidates must demonstrate natural or corrected near-distance visual acuity sufficient to read at least Jaeger Number 2 (or equivalent) at a distance of not less than 12 inches (30.5 cm), and must be able to distinguish and differentiate contrast among the colors or shades of gray used in the method being performed — checked at certification and re-verified annually. If you're colorblind in a way that affects gray-scale or color-contrast discrimination, some methods (particularly those relying on colored dye penetrants or contrast interpretation) may be closed to you, though many colorblind technicians work successfully in methods like UT and RT where contrast discrimination isn't the deciding factor. Get your vision checked before you commit money to training.

Step 2: Choose Your Entry Point

There are two realistic paths into NDT, and neither one is objectively "better" — it depends on your situation.

• Trade school / formal training program: A structured multi-week course that combines classroom theory with hands-on practice on real specimens, usually culminating in a Level I (and sometimes Level II) certification exam. This is the faster, more structured route if you're starting from zero with no industry contacts, and it's what most people mean when they say "go to NDT school."
• Direct hire + employer-sponsored certification study: Some companies hire trainees with no NDT background into a Level I trainee role, then put them through in-house or contracted classroom training while they accumulate on-the-job hours under supervision. This path is common if you already work in an adjacent trade (welding, machining, quality inspection, military technical roles) and an employer is willing to sponsor your certification.

Neither path skips the classroom-hours-plus-OJT-hours requirement in SNT-TC-1A — they just differ in when you get hired relative to when you finish training. If you want the exact hour breakdown for each level and method, see How Long Does NDT Training Take?.

Step 3: Pick Your First Method

You don't need to certify in every method at once. Most technicians start with one or two accessible methods — Visual Testing (VT) and Liquid Penetrant Testing (PT) are the most common entry points because they require less specialized equipment and shorter classroom hours — then add Magnetic Particle (MT), Ultrasonic (UT), or Radiographic (RT) as they gain experience and their employer's needs dictate. Ultrasonic Testing tends to carry the strongest and most consistent demand across industries, so many technicians prioritize adding UT once they have a foundation method under their belt.

Step 4: Progress Through Level I → II → III

NDT certification isn't a single credential — it's a three-tier ladder, and each level unlocks more independent authority:

• Level I — performs specific tasks under a written procedure and direct supervision; sets up equipment, runs the test, records results, but does not independently interpret or accept/reject. Typical entry point: no prior NDT experience required.
• Level II — works independently: sets up and calibrates equipment, performs inspections, interprets and evaluates results against acceptance criteria, writes reports, and trains Level I personnel. Most working field inspectors are Level II.
• Level III — the technical authority: writes and approves procedures, certifies Level I and II personnel, interprets code, and takes final responsibility for the inspection program. Getting here typically takes years of Level II experience plus passing ASNT's Basic and Method exams.

For a full side-by-side breakdown of what changes in authority, pay, and daily work between Level II and Level III — including a section on where Level I fits into the picture — see our NDT Level 2 vs Level 3 comparison guide.

Step 5: Know What Your First Job Actually Looks Like

Realistic expectations matter here. A first Level I job is not glamorous: you'll spend a lot of time on equipment prep, calibration checks, surface preparation, and running tests under someone else's supervision and sign-off, often in shift-work or turnaround-style schedules (early mornings, nights, or compressed multi-week outages). You will not be interpreting borderline calls independently, and you will not be writing procedures. What you're building in that first year is the documented experience-hour base that lets you sit for Level II — so treat the grunt work as the actual credential-building activity it is, not a detour from the "real" job.

Step 6: Formal Training as a Next Step

If you've confirmed the vision requirement and decided formal training is the right entry point for you, Atlantis NDT runs ASNT SNT-TC-1A and ISO 9712-aligned Level I, II, and III training programs across UT, RT, MT, PT, VT, and ET, with a documented 96% first-pass rate across cohorts since 2019. We also run ASNT certification preparation for candidates studying independently, and corporate NDT training for companies onboarding technicians in-house. None of this is a requirement to start your career — it's one route among several — but it's worth knowing what a structured program actually includes before you commit to a self-study path instead.

Frequently Asked Questions

Q1: How to become an ASNT Level II NDT technician — what are the requirements?

A: Hold a current Level I certification (or meet the direct-entry experience-hours option), complete Level II classroom training in your chosen method, log the required on-the-job experience hours under a certified Level II or III, and pass the Level II written and practical exams per your employer's SNT-TC-1A written practice.

Q2: Can I become an NDT technician without any prior experience?

A: Yes. Level I certification is designed as an entry point and does not require prior NDT experience — you build experience hours after certifying, under supervision, on your way to Level II.

Q3: What disqualifies someone from NDT work?

A: The most common disqualifier is failing the required near-vision and color/contrast acuity test. Beyond that, most NDT jobs involve some physical demands (climbing, confined spaces, standing for extended periods, lifting equipment) that can be limiting depending on the role and method.

Q4: Is on-the-job training paid?

A: Typically yes — most Level I trainees are hired into a paid entry-level role and accumulate their required OJT hours as part of that job, rather than working unpaid.

Q5: How long until I'm fully certified and working independently?

A: Level I can be reached in a few months. Level II, where most independent field work happens, typically takes one to two years of combined training and OJT hours. See How Long Does NDT Training Take? for the full breakdown.

Related: What Is NDT? A Complete Beginner's Guide, Is NDT a Good Career in 2026?