This digital pH testing pen stands out with ultra-fine 0.01 pH high resolution for ultra-precise liquid acidity and alkalinity detection, covering the full 0–14 pH measurement range. Built-in automatic temperature compensation eliminates temperature interference, delivering stable, consistent lab-grade readings every time.

Fitted with a clear LCD screen, it supports simple two-point manual calibration with standard buffer solutions for long-term accuracy. The compact pocket-sized ABS body is lightweight and portable, ideal for field testing at any time. An auto-shutdown function saves battery power effectively for frequent daily use.

Its replaceable glass electrode extends service life and cuts maintenance costs. Perfect for aquariums, hydroponics, swimming pools, drinking water, wine brewing and school lab experiments. Far more reliable than test strips, this affordable precision tester is a must-have for growers, water keepers and amateur lab enthusiasts.