Bluelab pH Pen Overview Advice The ultimate handy solution for measuring pH! Plants get their nutrition from minerals but they can only get all the right minerals they need if certain conditions are right. A key factor that affects food uptake is whether the solution is acid or alkaline. This is measured in pH. The Bluelab pH Pen is the latest innovation for hand-held meters. It provides a compact, quick and handy way to manage the success of crops, to ensure maximum uptake of nutrients. Teamed with the Bluelab EC Pen or Bluelab ppm Pen, it is a handy, convenient and accurate system for ensuring optimum plant growth and health. Features Measures pH and temperature Selectable units for °C & °F Backlit LCD display Double junction probe (not replaceable) Successful pH calibration indicator Hold function Low battery warning Fully waterproof Auto off function Automatic temperature compensation BLUELAB pH PEN Product DEMO This official instruction video shows how to hydrate, use and calibrate a Bluelab pH Pen before the first use. Tips for storage and care of the pH pen are included at the end of the video.