You are buying a Quad Maxim MAX31856 breakout board for 5V systems.  This board has 4 MAX31856's on it to read the temperature of 4 thermocouples.  The datasheet for MAX31856 can be found on Maxim's web site (sorry, eBay doesn't allow links).

The MAX31856 is the latest thermocouple IC from Maxim, and is significantly better than the MAX31855:
  • 19-bit temperature resolution (MAX31855 is only 14-bit)
  • Handles all thermocouple types (K, J, N, R, S, T, E, and B)
  • Allows readings as high as +1800°C and as low as -210°C depending on thermocouple type
  • Line frequency filtering of 50Hz and 60Hz is included
  • Many configuration options, like number of samples to average, fault masking, fault triggering etc.

You also get a low-mass, highly responsive k-type thermocouple probe capable of measuring -50°C to 700°C (-58°F to 1292°F).

Note: the DRDY and FAULT lines are not exposed. These are not needed if you poll for temperatures.

Library and example application for Arduino can be found on Github (look for engineertype's MAX31856).

Specifications:
  • 4 x MAX31856MUD+ Thermocouple-to-digital converter
  • Measures -210°C to +1800°C with 19-bits of resolution
  • Five LEDs: one indicating power and the other 4 to indicate faults
  • DC-to-DC power converter to convert your 5V into 3.3V needed by the MAX31856
  • Built-in level shifters to translate between 5V (your controller) and 3.3V (used by the MAX31856)
  • Breadboard-friendly 9-pin 0.1" header
  • 0.2" (5.08mm) screw terminals for thermocouple probe wires
  • Two screw holes for mounting the board
  • Dimensions: 2.0" x 1.6" (50mm x 40mm)
  • Compatible with Arduino, PIC and other 5V microcontrollers
Included in this auction:
  1. Quad MAX31856 thermocouple breakout board for 5V systems
  2. One low-mass k-type thermocouple probe (you can get more here)

Note: If you want to use this board on a 3.3V system you can just change the solder jumper on the board.

The IC's were bought directly from Maxim, and are RoHS compliant. Boards designed, assembled and tested in California.

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