What Are These?

[spongella]

I've scavenged these two parts from a wireless thermometer and was wondering what they are, and the significance of the numbers stamped on them? Antennas? Caps? Thank you.

 

[AK9R]

Could be interdigital filters.

 

[W1KNE]

They look like contacts. You know those rubber buttons like you see on remote controls that have a conductive inner part to them? Those.

 

[spongella]

Thank you for the responses. I don't think they are contacts, although they do look like them. They were soldered onto the circuit board where no rubber buttons were.

Never heard of interdigital filters though. Let me read up on those.

Again tnx and 73's.

 

[KD5AKR]

They could be Moisture sensors.

 

[kf8yk]

Humidity sensor: https://www.openimpulse.com/blog/wp...R202L-Resistive-Humidity-Sensor-Datasheet.pdf