JH Technologies · JH SEM Academy

Master the SEM before you ever touch one.

A full scanning-electron-microscope trainer with a 14-week technician-readiness curriculum built in — beam physics, sample preparation, and a real COXEM EM-40 workflow. It runs in the browser — nothing to install.

Use It Online → License it for your institution
Sign in with your school email — the app runs in the browser and is always the current version, so a class never sits on an old build. License it for your institution.
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 trains

Every control a real technician has to learn.

Not a slideshow — a physics-driven trainer. 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 & the chamber

Pump-down and venting on the instrument's own interlocks, VENT / LV / HV modes, and the detector and kV limits each one imposes — the sequence that starts and ends every session.

🧪

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 trainer 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
    Capstone — Applied Investigation
    An independent project, documented to a professional standard
6
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 · an uncoated insulator NMC Battery Cathode Unknown Contamination · case study Honey Bee Compound Eye Jumping Spider Eye + 6 more presets
Licensing

License it for a whole program.

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

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

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

Runs in the browser on any Chromebook, tablet, or PC — nothing to install, nothing to update.

Use It Online →