Bluelab is a company that specializes in designing and manufacturing precision instruments for measuring pH, conductivity, and temperature in a variety of industries including hydroponics, aquaponics, and agriculture. One of their products is the Bluelab Inline pH Probe. The Bluelab Inline pH Probe is a highly accurate pH probe designed for use in-line with a water system, allowing for continuous monitoring of pH levels. It features a replaceable double junction pH probe, which means that the probe has two reference junctions to ensure more accurate readings and a longer lifespan. The probe also has a tough, reinforced cable to withstand wear and tear from continuous use. The Bluelab Inline pH Probe can be used in a variety of applications, including hydroponic systems, aquariums, and water treatment facilities. It is compatible with the Bluelab Pro Controller, which allows for automated control of pH levels in a system.