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Ohaus Pen pH meters provide accurate readings and a straightforward operation at an affordable price. A ph tester is useful in the field or lab for soil classification and other applications measuring pH or relative acidity or alkalinity of a sample at a given temperature. These meters have a pH measurement range from 0 to 14pH. The working environment for both units is 50°F to 104°F (10°C to 40°C) and 85%RH, non-condensing.
The pocket-size meters display readings on a large, easy-to-read digital LCD display. These digital pH meters endure prolonged environments and are constructed with durable ABS housing. They also feature an IP67 waterproof design to prevent water damage.
A protective cap to safeguard the sensor and a wrist strap is included. Meters have an automatic shutdown feature that preserves battery life. The waterproof ph meters operate for approximately 200 hours on four included AG13 button-cell batteries.
MA-257 has a range of 0–14pH, 0.1pH resolution, and accuracy of ±0.1pH. The built-in electrode is factory calibrated with no need for use of Buffer Solution. It features a single-line LCD display.
MA-258 has a range is 0–14pH, resolution is 0.01pH, and ±0.05pH accuracy. It also has temperature compensation with a range of 0–99.0°C (32.0 to 210.2°F). The built-in electrode features a 3-point calibration using 4.01, 7.00, and 10.01 Buffer Solution (sold separately). The dual-line LCD screen displays pH and temperature values.
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