Buy the Sensor hardware:
EU customers: http://www.firsensor.com
Rest of the World:

DIY with the open source hardware files: https://github.com/RHWorkshop

Functions:
- The thermal data can be shown as an overlay on your camera picture.
- You can take a screen shot of the display with the thermal data on top of the camera picture.
- Select different palettes, 6 in total.
- Change the transparency of the thermal data.
- Align the sensor data with the camera picture.
- Re-size the camera picture for better alignment with the sensor data (settings menu).
- Change sensor orientation (settings menu).
- Change the threshold.
- Pause the on screen data for easy adjustment and fine tuning.
- On screen minimum and maximum temperatures.
- 3 Auto scale functions.
- 1 Manual scale function.
- Celsius or Fahrenheit (settings menu).
Communication with the hardware is done by Bluetooth SSP.
Supported sensor hardware:
- IR-Blue sensor hardware
- MarDaSo sensor hardware
If you want the app to support other or your sensor hardware please contact me.
Minimum phone specs:
- 800x480 screen resolution.
- BT 2.1
- Android 2.3
Tested on:
- HTC One X
- ZTE Blade
- JXD S80 8" Tablet
- Nexus 4
- Galaxy S WiFi 5.0 YP-G70
- Samsung Note
End User Licence Agreement:
EULA
Quick start PDF:
IR-Blue Android Quick Start V2