This newly upgraded 3-in-1 multifunctional water test pen integrates TDS, EC and temperature detection with unique real-time voice broadcast function, allowing hands-free reading without staring at the screen, greatly improving operation convenience for lab workers, growers and families. Adopting high-sensitivity titanium alloy probe and built-in ATC automatic temperature compensation, it delivers stable ±2% accurate data within 0–9990ppm TDS and 0–9990µS/cm EC measuring ranges, eliminating reading errors caused by temperature fluctuation. Equipped with a clear backlit LCD screen, it supports data hold, low-battery reminder and auto power-off to save power effectively. Made of splash-proof lightweight ABS housing with a protective probe cap, the compact pen-shaped design is easy to carry and store. It supports one-button quick calibration for long-term stable use, widely applied in hydroponic planting, aquarium care, drinking water filtration, swimming pool maintenance and laboratory liquid testing. Pre-calibrated before delivery, this voice-activated water quality detector is a user-friendly, cost-effective testing tool for daily and professional water parameter monitoring.