The TA621A Digital Thermo-Hygrometer is a high-accuracy, low-power, and portable environmental measurement instrument, also known as a digital temperature and humidity meter, humidity tester, thermo hygrometer, humidity gauge, environmental humidity monitor, dew point meter, and wet bulb thermometer. Equipped with a high-performance GXHTC3 temperature and humidity sensor, dedicated signal processing chip, and precision operational amplifier technology, it delivers fast response, stable performance, and accurate measurement of ambient temperature and relative humidity, while automatically calculating dew point temperature (DP) and wet bulb temperature (WB). The TA621A digital thermo-hygrometer features high/low temperature and humidity alarms, data hold, maximum/minimum/average value recording, and ℃/℉ unit conversion functions. Its clear digital display and compact handheld design make it ideal for quick environmental inspections and continuous monitoring. With reliable measurement performance and easy operation, the TA621A is widely used in warehouse storage, cold chain logistics, archive management, pharmaceutical storage, laboratories, cleanrooms, manufacturing workshops, server rooms, smart buildings, greenhouses, agricultural production, livestock farms, educational laboratories, and residential environmental monitoring. Whether used for warehouse climate control, industrial process monitoring, equipment room inspection, laboratory research, building environment evaluation, or daily indoor comfort management, the TA621A provides an efficient and accurate solution for temperature and humidity measurement.