I looked in to a lot of the K2 discussions but did not notice one that mentioned modifications to the unit.
Just wanted to let you all know that you CAN modify the unit.
Like mostly everyone else we bought this unit for the group and had high expectations.  Needless to say after we used the unit we thought what mostly everyone else thought.....  WHAT a P.O.S., couldnt beleive we paid money for it.  Like everyone has stated you CAN make the meter go up and down by adjusting the pressure on the switch.
Well we fixed that problem on our unit.
Our one guy just placed a power bypass from the thumb swith to a on/off button.  Now we just flip the on switch and there is power to the unit that is NOT CONTROLED BY PRESSURE so we get a continuous reading.
I suggest that everyone do this so there are no false readings by "accidently" moving your thumb.
Good luck and please let me know if anyone else has done this and if it seemed to improve the readings.
Ryan