Ohaus Starter Pen Series Portable Hand-held pH Meters
Two models with varying resolution and accuracy, ST10 and ST20 offer a convenient way to measure pH, or the relative acidity or alkalinity of a sample at a given temperature. The pH pen meters can be completely operated with just one hand, freeing up your other hand to handle samples.

Download the brochure and see the other Starter Pen Meters in the range here: Starter Pen Meter Data Sheet.