Eco pH+ Tester Pen by Trans Instruments

Requires calibration solution, which is sold separately

The Eco Series pH+ Tester Pen gives fast, accurate, and easy to read pH readings. No more need for test strips or color test kits! This convenient test pen makes it easy to do frequent testing for accurate, safe pH control. Controlling pH effectively helps balance water chemistry, enhance fish coloration, promote spawning and control CO2 levels. Includes protective case and (4) 1.5V button cell batteries.

• Easy to Use: One-Touch Calibration, beeps after each reading
• Durable: drop shock resistant, water resistant, floats in water

Use this link for Calibration Solution.

Manual