The Bluelab ppm pen provides a compact, quick and handy way to manage the success of your crops to ensure they have the nutrients they need. Teamed with Bluelab's pH Pen, you have a handy, convenient and accurate system for ensuring optimum plant growth and health.

• Fully waterproof, not just water-resistant
• Selectable measurement units so you can customise with your preferences
• Flat electrode for easier cleaning and maintenance
• Hold reading function to capture every measurement with ease
• Automatic temperature compensation for accurate readings anywhere
• Auto-off function to extend battery life
• 1 x AAA alkaline battery included, getting you started immediately