This is the silicone keypad set used in the T400. It consists of two three-button keypads.
Black print on white silicone.
There are icons for power, backlight, graph display, recording start/stop, time interval, and temperature units.
These keypads are designed for use with tactile switches and do not have carbon pads.
Learn more at: http://paxinstruments.com/products/sku2074/