The TR-74Ui illuminance UV recorder from TandD can measure and record illuminance, UV light, temperature, and humidity simultaneously. Additionally, the device can display cumulative illuminance and the cumulative amount of UV light on the LCD display. The luminosity range covers 0-130 k lx and low light resolution to 0.01 lx. The UV range measures 0-30 mW/cm2. The unit can store up to 8000 readings on four channels for a total of 32,000 readings in one-time or endless recording mode.