You touch an object/surface and create an invisible sensor on the side opposite of where you touch. The spell can penetrate up to 5ft of most materials but fails to penetrate lead or bismuth. If you cast the spell on a hollow object, such as a crate, chest or sarcophagus, you can create a sensor within the object. The sensor remains in place for the duration but becomes dormant if you're not touching the initial spot.
When you cast the spell, you choose seeing or hearing. You can use the chosen sense through the sensor as if you're in its space. While seeing through the sensor, you have darkvision out to a range of 10ft. As your action, you can switch between seeing and hearing.
A creature that can see the sensor (such as benefiting from See Invisibility or Truesight) sees a luminous, intangible orb about an inch in diameter.
At Higher Levels. When you cast this spell using a slot of 2nd or higher, the material's thickness the spell penetrates increases by 10ft for each slot above 1st.
* - (a focus worth at least 10 gp, with a glass cup for hearing or a silver pin for seeing)
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