The TA654 Series External Microphone Digital Sound Level Meter is a professional environmental noise tester, decibel meter, sound level meter, and industrial noise monitoring instrument designed for accurate and reliable sound measurement. Equipped with a high-sensitivity condenser microphone probe and A-weighting measurement mode, it measures ambient noise levels from 30 to 130dB with fast response and stable performance. Unlike traditional sound meters with built-in sensors, the TA654 Series features a 5-meter external microphone probe that allows flexible sensor installation away from the main unit. This design makes it especially suitable for challenging measurement environments such as high-temperature areas, confined spaces, elevated equipment, machinery areas, and locations where direct instrument placement is difficult. The series is widely used for factory workshop noise testing, industrial equipment noise analysis, construction site noise monitoring, road traffic noise measurement, school acoustic assessment, commercial building noise control, data center and machine room monitoring, environmental protection inspections, and occupational health and safety applications. Featuring a 4-digit high-brightness LED display and a 6-level LED noise indicator, the instrument provides clear readings even in large industrial environments. Users can set customized alarm thresholds and alarm durations. When the measured noise exceeds the preset limit, the device automatically activates audible and visual alarms for effective noise risk management. The TA654B model supports data logging, USB communication, and PC software management, enabling measurement recording, historical data review, trend analysis, and long-term noise monitoring. It is an ideal solution for industrial production management, environmental monitoring, workplace safety evaluation, and professional acoustic measurement. With accurate measurement capability, flexible remote microphone installation, multiple mounting options, and advanced data management functions, the TA654 Series external microphone sound level meter, noise detector, decibel tester, and environmental noise monitor provides a reliable solution for manufacturing, environmental protection, construction, public facilities, and research applications.