By Phil Ambrose
Founder, HazSim · Battalion Chief (Ret.)
Here’s something that doesn’t get said enough in the fire service: most firefighters have never trained on their meter in conditions that actually look like a real call.
They’ve sat in a classroom. They’ve learned the buttons. Maybe they’ve bumped the sensor and watched the display cycle through its startup. But they’ve never seen their meter climb in real time while they’re trying to make a decision in a basement with zero visibility.
Because the only way a real meter gives you a reading is if there’s real product in the air. And you can’t fill a training room with hydrogen sulfide or drop the oxygen level to 16% to see what your crew does.
So what actually happens? Departments issue meters, cover the basics in a classroom, and send people to calls where they’re expected to interpret readings they’ve never seen on a live display. They’re carrying an instrument they’ve never truly trained on.
That’s been the gap for decades. And it’s bigger than most people admit.
Most firefighters aren’t just weak on the advanced stuff. They’re weak on the fundamentals. They don’t know what a real LEL reading looks like when it’s climbing. They haven’t watched CO spike and then had to decide whether to pull the crew or keep working. They’ve never seen their oxygen reading drop and had to figure out why.
Not because they’re bad firefighters. Because there’s never been a practical way to give them those reps.
That’s why we built HazSim. The Pro 3 feeds live, dynamic values to the HazSim meter—replicating the same unit they carry on shift. Instructors control the readings in real time. The meter behaves exactly like it would on a real call, but there’s no hazardous atmosphere. Your people get reps on realistic scenarios they’ll actually face.
Here’s what changes when the meter is live and the instructor steps back.
In traditional training, the instructor is either attached at the hip of the student or feeding audio cues over the radio. The student is reacting to the instructor, not to the scene. The instructor becomes the training. Take the instructor out of the picture and the student has nothing to fall back on because every decision they made was guided.
With HazSim, the student is in the moment. The meter is climbing. The readings are real to them. Nobody is whispering the next step. The instructor is across the room watching, not coaching. The radio isn’t carrying instructor cues—it’s carrying real traffic. Dispatch updates. Other units reporting conditions. The kind of information that comes across the radio on an actual call and forces the responder to process, prioritize, and act.
That changes everything.
The radio traffic doesn’t just train the person holding the meter. It trains the entire team. The incident commander is making real decisions based on real reports coming from the entry team. The safety officer is tracking exposures. The technical reference team is researching the product. The decon crew is listening for clues to change up their operation. The backup team is paying attention to what they should be—a plan to enter and rescue the entry team. Everyone is actively engaged in the problem, not waiting for a cue.
We’ve seen this translate directly into incident command training. Departments that started with basic gas detection drills are now running full-scale IC exercises where the HazSim scenario drives the entire operation. JT Carricato at EMED Training has been qualifying OSHA On-Scene Incident Commanders using this kind of blended-technology approach—nearly 250 to date. When the readings are real and the radio is live, you’re not simulating command. You’re practicing it.
The departments that get this right aren’t chasing exotic scenarios. They’re creating experiences where their people have to make real decisions under real pressure, and they’re doing it in a bay on a Tuesday night where the cost of failure is a debrief, not a body bag.
NFPA 1010 now recommends documented gas detection competency for every firefighter. Not just the hazmat team. Every member of every shift. That’s a different problem than most departments have planned for. You’re not training 12 techs anymore.
The departments moving on this aren’t buying more classroom time. They’re getting their people’s hands on the meter and giving them the reps that only come from repetition. Because there’s no shortcut to competency. There’s only practice.
That’s what HazSim does. That’s all it does. And after a decade of watching departments go from zero confidence to automatic response on gas detection calls, I can tell you the formula hasn’t changed. Hands on the meter. Real scenarios. Real reps. Repeat.
Phil Ambrose is the founder of HazSim and a retired battalion chief with over three decades in the fire service. He is a regular presenter at FDIC and founder of Hazmat Nation. Reach him at [email protected].
