3-in-1 Measurement
Measures pH, EC, and temperature in a single handheld combo pen.
High-Contrast Display
Black display with white characters improves readability over the original Pro.
Selectable Precision
Choose 1 or 2 decimal precision to match the level of detail you need.
30-Day Calibration Reminder
Prompts recalibration after 30 days, so accuracy never quietly drifts.
IP67 Waterproof & Floats
Fully waterproof and buoyant, so an accidental drop into your reservoir won't cost you the pen.
Replaceable Electrode
Swap the sensor for a compatible Aqua Master Tools S300 Pro 2 pH Electrode instead of replacing the whole pen.