This portable ammonia gas detector uses a built-in sampling pump and telescopic probe to draw in air, displaying concentration readings on a 2.8-inch color LCD with visual, audible, and buzzer alarms set to user-defined thresholds. It stamps each reading with a real-time clock and date, and adds a low-battery warning with auto shut-off. Power comes from a rechargeable Li-ion battery or the included AC adapter, the kit ships complete with filters and a carrying case, and this unit includes a traceable NIST calibration certificate.