The handheld X1-1 from Gigahertz-Optik Inc., Newburyport, MA, provides and displays separate UV-C/B, UV-A detector measurements and can calculate and display the sum of the two detector readings for more accurate UV hazard assessment per ACGIH/ICNIRP guidelines. The XD-9506 detector covers the full ACGIH/ICNIRP UV spectral-effectiveness function by using 2 sensor/filter/diffuser combinations for separate ACGIH UV-A (325–400 nm) and ACGIH UVC/B (250–325 nm) spectral responses. The detector features dose measurement, run/hold, a USB interface, and a backlit LCD.