This handheld pH Meter reads pH range 0-14. It comes with small packs of pH calibration buffer solutions as well as a calibration screwdriver, three 1.5V batteries, and instructions. It can be calibrated to a single point by turning the set screw. Resolution is 0.1 pH and accuracy is reasonable for an economy meter in the range of 0.1-0.2 pH (at 68° F).
For proper calibration and storage of the meter, be sure to stock pH calibration buffer solutions as well as electrode storage solution.