The present invention realizes an ion exchange apparatus capable of enhancing the reliability of regeneration operation. An area formed by a mix of the second width and the second length is for the laminated printed circuit board and multiple positioning holes are respectively defined in two adjacent margins horizontally respective to end sides of two adjacent margins. A stacking unit stacks a plurality of sheets that are conveyed by the conveyance unit. Within the DAU, selection multiplexers select full adder outputs to provide Y, or bit-select from adders and the input to provide Y. Relying on a band separation filter, the wavelength rx is separated from the reference signal and coupled to a gas cell of a known spectrum, a filtered signal of the wavelength rx is then coupled to a photo-detector for subsequent electrical measurement. Multiple different interchangeable male adapter bases are provided each having a round-tipped diamond-patterned male base plate that fits into and mates with a complementary round-tipped diamond-patterned receptacle formed in one of multiple different interchangeable female receivers.