Bluelab pH Pen

A hardy, compact pH and temperature pen - perfect for quick and easy pH and temperature readings direct from your solution.

• Fully waterproof - not just water-resistant
  
• Simple two-point calibration process for accuracy
  
• One-year peace-of-mind warranty
  
• Automatic temperature compensation for accurate readings everywhere
  
• Auto-off function to extend battery life
  
• 1 AAA battery included - simply power on and go
  

Comes with a 1-year limited written warranty. 

Product manual can be found here.