I'm considering this one. (*edit , meter or pen.)

http://www.testmeter.sg/products/DYS...-pH-Tester/184

ideally features I like would be
no need to replace probe/indestructable probe (ie: an isfet based one). but that's not within budget

so more real expectations are
a) replacement probe
b) 3 point automatic calibration (ie: no need to use a screw)
c) atc function
d) multifunctional = measures tds/temp/gh/kh/nitrate (lol dreaming)