Simultaneously measuring and recording four parameters: illuminance, ultraviolet light (UV), temperature and humidity, the TR-74Ui-H four parameter data logger achieves a temperature measurement accuracy of ±0.3°C (between 10 to 40°C) with an overall range of -30 to 80°C. The humidity measurement accuracy is ±2.5% (at 25°C, 10 to 85% RH) with an overall range of 0 to 99% RH. It is also capable of displaying cumulative illuminance and cumulative amount of UV light in the LCD display. With large data capacity that can store up to 8,000 readings by four channels for a total of 32,000 readings it connects to a computer via a USB port.