The short version
- Stick drift is when your character or camera moves without you touching the stick. It mostly comes from worn-out parts.
- Most standard sticks use potentiometers, which physically rub as you move them and wear down over time.
- Hall effect and TMR sticks read a magnet instead, so nothing inside rubs or wears out the same way.
- TMR is the newer, more sensitive option. The leaked Xbox Elite Series 3 reportedly offers both.
Why sticks drift in the first place
Inside a typical thumbstick are two potentiometers, one for each axis. Each has a small contact that slides along a resistive track as you move the stick. The controller reads the change in resistance and works out where the stick is pointing.
The problem is that sliding. Years of flicks wear the track down, and dust gets in. Eventually the reading stops returning to a clean centre, and the controller thinks you're still pushing slightly in one direction. That's drift.
Hall effect: a magnet and a sensor
A Hall effect stick puts a small magnet on the stick and a sensor underneath. When a magnetic field passes through the sensor, it produces a tiny voltage. Move the stick, and the field changes, and so does that voltage.
The key difference: nothing touches. With no rubbing contact, the part that usually wears out simply isn't there. That's why Hall effect sticks have become a common selling point on third-party controllers.
TMR: the same idea, more sensitive
TMR stands for tunnel magnetoresistance. It also reads a magnet, but the sensor works differently: a very thin insulating layer between two magnetic layers changes its resistance depending on the field around it.
In practice that makes TMR sensors more sensitive than Hall effect ones and typically lower on power use. For a controller, that can mean finer precision and a little more battery life. It's also why the Elite Series 3 leak lists TMR as the pricier option.
Which one should you look for?
On paper, either is a big step up from potentiometers if drift has burned you before. TMR has the edge on sensitivity and power. Hall effect is more common and usually cheaper. Neither makes a controller immune to every fault, but both remove the main cause of drift.
For what the leaked Elite controller is said to include, see our Elite Series 3 leak post.
Images: Microsoft / Xbox.
