When it comes to quality and performance, the AZ waterproof pH pen is the clear choice.

ATC (auto temperature compensation) ensures accurate readings in all climates. Auto off function maximises battery life.

• Low cost pH pen
• Big LCD dual display Temp. & pH value with ATC
• One touch for auto-calibration
• Waterproof housing meets IP65 rating
• Automatic buffer recognition to avoid errors during calibration