If you don't make a thermocouple board, I was going to build my own (mine would not be nearly as professional as yours.....) The AD595 chip is specifically for a type K theromcouple. If you use a socket for the chip then you can easily use the AD594 chip for type J thermocouples. Same circuit for either chip. Cold junction compensation, will accept 5 volts as the supply voltage, and only needs a decoupling capacitor on the input (no other components!).