The HALO pH Probe Bluetooth from Hannah Instruments is an innovative Bluetooth Smart pH and temperature probe that turns your compatible Apple or Android device into a full‑featured pH meter using the free Hanna Lab App. Designed with a refillable glass body and spherical sensing bulb for general‑purpose use, HALO delivers precise pH measurements from aqueous solutions with high reliability, just like the Professional Portable Soil pH Meter and Portable pH/ORP/ISE and Temperature meter. Its double‑junction design resists clogging and maintains stable readings, while the built‑in temperature sensor ensures accurate temperature‑compensated results. Pairing is effortless with one‑press Bluetooth connection, and the LED halo status indicator provides visual feedback on connectivity. Real‑time data, five‑point calibration, and data logging make it ideal for lab, field, and educational use. Powered by a replaceable CR2032 battery with long life, HALO offers flexible, wireless pH testing wherever you need it.