Me mates had one for over15 yr an mine lasted over 10 yr till batteries leaked, but all ph pens are a different one they are absolute shite and warranties from bluelab and their sellers are the same
Having a nightmare, ph pens waste of time an money One Stop Hydro are a vucking nightmare smashing the probe to invalidate any warranty been on to bluelab hopefully UPS will get the blame an I1`ll get me money back sticking with indicator fluid all PH pens are unreliable and and overated