Electronic pH tester

This pH pen suits keepers who test water chemistry in exotic aquatic setups and want a compact, battery-powered meter instead of strips or drop kits. It covers the full 0.0–14.0 pH scale and reports values to 0.1 pH, which is enough to track gradual shifts between water changes.

Why it matters

• Automatic temperature compensation: the ATC circuit adjusts the displayed result for water temperature, so readings taken at different temperatures remain comparable. The ATC operates within 0–50°C.
• Defined measuring range: 0.0–14.0 pH with a stated accuracy of 0.1 pH gives a clear resolution for monitoring acidic and alkaline conditions.
• Manual single-point calibration: the meter is calibrated at one point by hand, which keeps the calibration routine simple to repeat.
• Compact, light body: at 152 x 30 x 21 mm and 50 g, the pen is small enough to store in a equipment box and quick to use at each water check.

Specifications

• Measuring range: 0.0–14.0 pH
• Accuracy: 0.1 pH
• Calibration: single-point, manual
• ATC operating range: 0–50°C
• Environmental conditions during measurement: 0–50°C, humidity up to 95%
• Power: 3 x 1.5 V batteries
• Dimensions: 152 x 30 x 21 mm
• Weight: 50 g

What it works with

The pen is listed in the water chemistry and testing category of exotic aquatic equipment, so it fits routine pH checks in aquariums and other water-based enclosures for exotic species. Its operating range of 0–50°C and its compact size make it practical for spot checks at the tank, with ATC handling temperature changes during the test.