Lutron PH-222 – Pen PH Meter

Lutron PH-222 is a pen-style pH meter that measures from 0 to 14.00 pH. It automatically compensates for temperature changes and calibrates itself for pH 4, pH 7, or pH 10. The meter includes a pH electrode and is waterproof. It’s easy to replace the electrode and carry around. It also has a data logging feature. Plus, it comes with pH 4 and pH 7 standard solutions and runs on four long-lasting AA batteries.