i use
Bluelab meters. i have used all of their meters. its worth spending the $ on the combo or the guardian, only if its taken care of properly. Celtic has a great tip of zip tying the cord to the probe. unfortunately, pH probes only last for about 1 year, 1.5-2 if taken care of properly. which means cleaned and calibrated once a month and stored in a pH storage solution. the solution im using is made by
bluelab and they stated its the same solution that is inside the actual probe, which is supposed to increase the longevity and accuracy of ur probe.
ive faught with Milwaukees, and the eco ph1's and 2's same fights, hard to return.
with
bluelab, if anything goes wrong, they just swap them out if its still under warranty. i know they had some issues early this year especially with thier ph and ppm pens, but they were cool on replacing them. any customer that brought back a bad pen, would simply leave with a brand new one. i sent back all bad pens and recieved credit for all!
side note - they also have a soil ph meter now that you can simply detach ur normal ph probe and screw the soil ph probe and have a reading on the same monitor! havent tried, but sounds cool. damn i would make a good sales rep for these bastards.