Siemens Wall Mounting Temperature and Humidity Sensor for Laboratories, Hospitals, Computers and EDP Centers Along with Calibration Certificate Model: QFA3171D (with LCD Display): Amazon.com: Industrial & Scientific
Siemens STIRANS AS100 Acoustic Sensor - Process Instruments
Siemens 563-102-01 Room Temperature Sensor 510-161-PCB FREE SHIPPING | eBay
Siemens Recalls Temperature and Humidity Sensors for Schools, Hospitals and Other Buildings Due to Fire Hazard | CPSC.gov