Checker 1 Economical pH Tester
Measure pH levels with the Checker 1pH Tester. It offers a replaceable pH electrode & works for 3,000 hours before changing batteries.
Easy to recalibrate using the adjustment screws on top of the unit body.
We recommend both 4.01 and 7.01 buffer solutions for recalibration and storage solution to prolong the life of the electrode.
Highly recommend this item to anyone needing a true PH reading.
can't get it to calibrate no matter how many times I follow the directions! So i don't know if my readings using it are accurate.