Ensure the continued effectiveness and accuracy of your meters and testing equipment by utilizing the Bluelab Replacement pH Probe. Designed to work with the Bluelab Combo and pH meters, as well as the Bluelab Guardian Meter, this replacement probe is an essential tool for maintaining efficiency. Over time, your original probe may wear out due to regular use, resulting in inaccurate readings. To avoid any interruptions in nutrient testing, it is important to replace the probe with proper maintenance and care. The Bluelab Replacement pH Probe features a gel-filled, non-refillable design with a double junction and waterproof cable joint for low maintenance. A probe holder is also included to keep the probe secure. The 2 meter / 6.56 foot standard cable with quality BNC connection provides reliable and durable performance. Plus, with a 6 month guarantee, you can trust in the quality and longevity of the Bluelab pH Probe.