Pen-Style PH Meters Compact Design Easy Testing

A pen-style pH meter (also called pen meter, pH pen, pH tester pen) is a compact, lightweight, handheld pH measuring device shaped roughly like a pen. They are designed for quick, convenient pH testing of liquids (and sometimes semi-liquids) outside a lab: aquariums, pools, hydroponics, food & beverage, basic water quality checks, educational use, field work, etc.