Khaen paat (-)
With 16 pipes; According to Blench "The most common version […] plays a two-octave diatonic minor scale and is tuned in half and whole steps similar to Western tuning. The pitch, however, is not standardized and varies considerably between instruments".
Pipe lengths according to Blench: from 2 to 3,5 feet (ca. 610-1067 mm).
Blench, Roger: The history and distribution of the free-reed mouth-organ in SE Asia (presented at the 14th EurASEAA meeting, Dublin, September 2012 (Draft submitted for proceedings, 2012), p.10.