The RTR-574 from TandD Corp., Saratoga Springs, NY, is a wireless, 4-channel data logger that monitors illuminance, UV, temperature, and humidity. The logger can also display cumulative illuminance and cumulative amount of UV. Measuring ranges include 0–130,000 lux and low-light resolution to 0.01 lux for luminosity; 0–30 mW/cm² for UV; 10%–99% for RH; and 0°C–55°C for temperature. The data logger is approx. 2 in. by 3 in., stores up to 32,000 readings in one-time or endless recording mode, and is compatible with the company's RTR-500 Series wireless data collectors.