pH PenPlus is the ultimate solution for measuring pH, perfect for quick and easy pH and temperature readings direct from your solution. The Bluelab® pH PenPlus with replaceable probe is the preferred option for hand held pH meters. It provides a compact, quick and handy way to manage the success of your crops to ensure maximum uptake of nutrients. A key parameter that affects nutrient uptake is whether your solution is acid or alkaline. The pH PenPlus is also about readiness. Keeping a replacement probe on hand means less downtime, less disruption and continued confidence in every reading. The Bluelab pH PenPlus. pH confidence you can rely on Measures pH 0.0 – 14.0 and temperature 0 – 50 ̊C / 32 – 122 ̊F Replaceable Double junction pH - temperature probe with screw cap probe design for quick replacement. Replacement Probes can be purchased HERE 30 day calibration reminder Temperature in °C or °F with selectable units Fully water & dust proof IP68 Backlit LCD display is bright & easy to read Simple two point calibration KCl filled silicone cap with internal sponge maintains probe hydration Hold reading function Low battery indicator Auto off function to conserve battery Automatic temperature compensation AAA replaceable alkaline battery included Heres what is in the box 1 x Bluelab pH PenPlus with replaceable pH and Temperature probe1 x Bluelab pH 7.0 Calibration Solution, single-use1 x Bluelab pH 4.0 Calibration Solution, single-use1 x Bluelab KCl Storage Solution1 x Multi-language Getting Started Guide (EN, ES, DE, FR)