So you are looking to get your hands on an affordable mixed reality headset like HoloLens? The Acer Windows Mixed Reality Headset is worth a look. It has a 2.89” x 2 display size, gyroscope, accelerometer & magnetometer sensors, and max resolution of 2,880 x 1,440-pixels. The headset also comes with a tracking VGA camera.
Thanks to this headset, you can walk around and interact with your environment without external sensors. It has 6 DoF positional tracking. The flip visor and adjustable headband provide you with a more convenient experience.