Temperature measuring board device and temperature measuring board thereof

A temperature measuring board device for use in measuring an oven temperature of a reflow oven, said temperature measuring board device comprising:

• a temperature measuring board including a modular substrate and a thermal compensation unit, said modular substrate including a plurality of substrates assembled to each other, each of said substrates having a first engaging portion, said thermal compensation unit including at least one surface-measured compensation member fixed to said modular substrate at a selected location;
• and
• a fixture supporting and fixing said temperature measuring board, and including a main body and a plurality of second engaging portions disposed on said main body;
• wherein said first engaging portion of each of said substrates is removably engaged to a corresponding one of said second engaging portions, and wherein a selected number of said substrates can be assembled to said fixture to form a desired shape of said modular substrate.