Grill Probes and Meat Probes: What Each One Measures
A pellet grill has two kinds of temperature sensor, and they answer different questions. The grill probe measures the air in the cooking chamber. The meat probe measures the inside of the food. Neither one can stand in for the other.
The grill probe
A grill probe, sometimes called a chamber or ambient sensor, is fixed inside the cooker. You don't insert it into food. On digital pellet grills it reports to the controller1. The controller then starts or halts the auger when the temperature crosses a set threshold1. The auger is a motor-driven screw. It feeds pellets from the hopper to the fire pot1.
That's how a pellet grill holds the temperature you pick. Pellet grills use automated fuel and air delivery, and can maintain a user-selected temperature1.
So the number on the main display is the air temperature at the spot where that sensor sits. It isn't the temperature of anything you're cooking.
The meat probe
A meat probe is made to go into the food. A meat thermometer measures the internal temperature of meat2. That matters because doneness correlates closely with internal temperature2. The air around a roast can be much hotter than its center for a long time.
For the tip to report something useful, it should sit in the thickest part of the meat2. Exact positions are covered in placing the tip.
Why the two numbers differ
They measure different things, so they'll rarely match. Here are the main reasons.
- Air versus food. Air heats fast. A thick piece of meat heats slowly, from the outside in. The probe tip is in the middle, so it lags behind.
- Different positions. The grill sensor sits in one spot in the chamber. Food sits somewhere else, and the air can differ from place to place.
- Different jobs. The grill sensor feeds the controller's loop. The meat probe, on most grills, only reports to you and may set off an alarm.
Neither reading is wrong because it disagrees with the other.
Quick comparison
| Grill probe | Meat probe | |
|---|---|---|
| What it measures | Air in the cooking chamber | Inside of the food |
| Where it lives | Fixed in the cooker | In the meat, removed after |
| What uses the reading | The controller, which runs the auger1 | You, and sometimes an alarm |
| What it tells you | Whether the cooker is holding its set temperature | How far along the food is |
Which one to watch
Watch the grill reading to see whether the cooker is holding steady. Watch the meat reading to judge the food. When the question is whether meat is cooked safely, only the meat probe, placed properly, can answer it. Official temperatures for each kind of meat are collected on the page about safe internal temperatures.
Exceptions
Some grills have a built-in meat probe port, and others take a separate wireless unit. How they connect varies by type, and that comparison is on its own page. What a given grill shows on its app or screen is set by its maker, so follow your own manual for what each number means on your model.
Cited material
- Pellet grill, Wikipedia
- Meat thermometer, Wikipedia
Keep reading
How a Meat Probe Works: Sensors, Wires and ReadoutsWhat's inside a meat probe, and how a sensor, a cable and a display turn heat into a number you can read on a pellet grill or a handheld unit.
Wired, Wireless and Built-In Probes Compared by TypeHow wired, wireless and built-in meat probes connect to a readout, and what limits the range of a wireless probe.
Where to Place a Probe in MeatWhere the probe tip should sit in roasts, poultry and patties so the reading means something, and what makes a reading misleading.