The Ohaus ST20 pH meter pen is the perfect solution for measuring pH levels in various environments. With its compact and economical design, this pen meter offers simple, fast, and straightforward operation. It features a durable IP67 waterproof ABS housing, a protective sensor cap and an automatic shutdown feature that preserves battery life, making it the ideal choice for use in rough, wet environments. With its measurement range of 0.00 – 14 pH and an accuracy of ± 0.1 pH, it is perfect for a wide range of applications. Its 3 point calibration, temperature range of 0 °C – 99 °C, automatic temperature compensation and temperature sensor of 50 KΩ NTC makes it even more versatile. The Ohaus pH meter pen is lightweight and portable and includes a wrist strap for easy handling. With its 200 hours battery life, you can be sure that it will last long enough to get the job done. It is perfect for scientists, researchers, and technicians who need accurate pH measurements in the field or in the lab.