JH Technologies · JH SEM Academy

Master the SEM before you ever touch one.

A full scanning-electron-microscope simulator with a 14-week technician-readiness curriculum built in — beam physics, sample prep, EDS & EBSD, and a real COXEM EM-40 workflow, running entirely in the browser.

No installation. No instrument required. Works offline once activated — or download the app to carry to a lab with no internet at all.
SEM Trainer — live in your browser
SE DETECTOR · 8,000× SEM Trainer simulated micrograph of a honey bee compound eye
10kV  SP=7  WD=10.2  x8000  HV  SE 5 µm
Built on the COXEM EM-40  ·  Grounded in real instrument documentation  ·  Designed for two-year colleges and technical programs
What it simulates

Every control a real technician has to learn.

Not a slideshow — a physics-driven simulation. Change a setting and the image responds the way it would on the instrument, so mistakes cost nothing but a moment.

Full beam control

Accelerating voltage, spot size, working distance, focus, astigmatism correction, and aperture alignment via the wobble tool — the exact skills that separate a technician from a button-pusher.

🧭

SE & BSE detectors

Switch detectors on the same field and watch topography give way to compositional contrast — the single most important concept in the course, made visible.

🔬

Vacuum & charging

Simulated pump-down, VENT / LV / HV modes, and realistic charging artifacts on uncoated insulators — the artifact every new operator has to learn to diagnose.

📊

EDS & EBSD modules

Acquire a spectrum, run point analysis, and generate grain-orientation maps — the analytical techniques that turn imaging into materials science.

🧪

12 sample presets

Metals, ceramics, a battery cathode, an unknown-contamination case study, and sputter-coated biological samples — a compound eye, a spider eye, an insect antenna.

🎓

Guided tutorial

A 30-step walkthrough that deliberately detunes the instrument, then guides a student back to a properly focused, corrected, well-exposed image.

JH SEM Academy — built in, not bolted on

A complete course lives inside the app.

Every module pairs lecture text with interactive lab checklists — some steps launch the exact simulator action a student needs to practice, right from the reading.

  • 1
    Foundations of Microscopy
    Resolution vs. magnification, why electrons beat light
  • 2
    How an SEM Works
    The scanning principle, the gun, SE/BSE, vacuum
  • 3
    Operating the EM-40
    kV, spot size, focus, astigmatism, aperture alignment
  • 4
    Sample Preparation
    Mounting, conductivity, charging, sputter coating
  • 5
    Imaging & Measurement
    Contrast mechanisms, scale bars, depth of field, artifacts
  • 6
    Analytical SEM — EDS & EBSD
    Elemental analysis and crystal orientation mapping
  • 7
    Capstone — Applied Investigation
    An independent project, documented to a professional standard
7
Full modules — lecture, lab, and interactive live-example demos in every one
70+
Auto-graded, shuffled multiple-choice self-check questions across the module quizzes
2
Full practice exams (Midterm & Final) with instant or grade-on-submit exam mode
7
Standard operating procedures — safety, startup, sample loading, shutdown
Stainless Steel 304 · grain boundaries & twins Alumina Ceramic · charging demo NMC Battery Cathode Unknown Contamination · case study Honey Bee Compound Eye Jumping Spider Eye + 6 more presets
Licensing

Try it free. License it for a whole program.

Every path below runs the identical app — the only difference is how access is granted.

Free for education customers. JH SEM Trainer — including the full JH SEM Academy curriculum — is included at no additional cost with every COXEM EM-40 purchased for an academic program.
View the EM-40 ↗
Individual

Free Trial

30 days, full access
  • Every module, lab, and quiz unlocked
  • EDS & EBSD analytical modules
  • No credit card, no install
  • Activate anytime after with your school email
Start Trial
Most common

Institutional License

Whole-domain access
  • Every @yourschool.edu email activates automatically
  • Students self-activate — no roster management
  • Revoke access for individual accounts anytime
  • Ideal for a course, lab section, or entire program
Request Access
Offline labs

Air-Gapped Activation

One key, one machine, forever
  • For lab computers with no internet connection
  • Self-service key generation from any online device
  • Lifetime activation — never phones home
  • Cryptographically bound to that one machine
Download the App →

Give your students 30 minutes on the instrument before their first lab hour.

Free for 30 days. No installation. Works on any Chromebook, tablet, or PC.