ITC sitting in the house
Talk to Dead People in the House

Vibration sensor
Geophone
Accelerometer and gyroscope. Set the phone on a table or the floor. Footsteps and knocks draw as a seismograph.
ACCSTANDBY
SEISMOGRAPH · TAP THE TRACE
m/s²
0.000
Threshold
0.125
Hits
0
−+
Recommended field setting
Sensitivity 72
High enough for footsteps and knocks, low enough that a still phone does not alarm.
Tap a setting to read what it does.