How to read grounded thermocouple with arduino R3

The question is in the tittle ...
I bought some type-K thermocouples but i found out that the junction type is grounded (not mention on their websites).. I already bought MAX31855 but it only works for ungrounded thermocouple.
I thought to change the probes but i need a penetration probe which is pratically always grounded ...
Please help me it's urgent!
Thank you!

The extremely difficult problem encountered when using a grounded thermocouple results from ground loops, which depend on your particular situation.

Make every possible effort to use ungrounded thermocouples.