First run on a terminal osmocom_fft -a hackrf -v -f 433e6 -s 8e6 -g 0
If you are using an rlt-sdr use osmocom_fft -a rtl=0 -v -f 433e6 -s 2048e3 -g 0 . Notice that on the right lower corner there is a rec button just record some transitions from the sensor and notice the frequency.
There is also rtl_433 application that will decode the temperature sensor, or your car tire pressure sensor or many things from an rtl-sdr, on your terminal just use rtl_433 -G
|rtl_433 in action using an DXPatrol MK4|