Ohaus pH Pen Meter ST20 – 0.01 Resolution [80817]

The Ohaus ST20 pH Pen Meter offers a fast, convenient, and reliable way to measure the pH (acidity or alkalinity) of a sample across a wide temperature range. Designed for education and general laboratory applications, the ST20 delivers 0.01 pH resolution and excellent accuracy, making it ideal for use in science classrooms, fieldwork activities, and technician‑led investigations. Its compact, handheld design ensures easy portability, while the dual display and intuitive interface make readings simple and clear for all users.

With a 3‑point calibration and compatibility with standard buffer solutions (pH 4.01, 7.00 and 10.01), the ST20 ensures dependable performance and consistent results. A built‑in auto‑shutdown feature preserves battery life, and the rugged casing is suitable for regular classroom handling. Powered by four AG13 batteries, this meter is ready to use straight out of the box.

Key Features

• Measurement range: 0.00 – 14.00 pH
• Resolution: 0.01 pH for high‑precision readings
• Accuracy: ±0.05 pH
• Temperature range: 0.0 – 99.0 °C
• Dual display for clear and easy viewing
• 3‑point calibration for improved accuracy
• Buffer groups: 4.01, 7.00, 10.01
• Auto‑shutdown: Activates after 6 minutes of non‑use
• Power: 4 × AG13 (1.5V) batteries
• Size & weight: 185 × 45 × 38 mm, 110g

Ideal for School Science Lessons & Practical Work

The Ohaus ST20 is an excellent teaching tool for KS3, GCSE, and A‑Level science lessons, offering a reliable and easy‑to‑use solution for experiments involving pH measurement. Its durable design and straightforward calibration make it ideal for repeated classroom use.

• Perfect for acid–alkali investigations and titration‑based activities