This video describes most commonly used 5 types of temperature and humidity data loggers. The term data logger is commonly used to refer recorders which record various parameters in electronic form. The classification is based on the type of usage and applications and the main types are: 1.USB type temperature and humidity data logger with LCD display and LED alarm indicators Single & Multi use models 2.USB type pdf temperature data logger with LCD display and dry ice data loggers Single & Multi use models 3.USB pdf type single use temperature data logger with LED alarm display without need of any software 4.High Temperature data loggers for industrial and food applications from -200 to 1000 Degree Centigrade 5.Real time monitoring and data logging over the internet with Phone call, Email& SMS alert facilities Please see further explanation for each of the above types.