Beam of Model LV-H42 sees targets in area too large for spot sensor, and does so without cost and complexity of multiple FO sensors. Supplied mask clips to sensor face, effectively constraining beam width. Bar LED display on rear panel indicates light level received. Multiple sensors mount side by side without interference. Paired amplifier displays current value and setpoint, performs automatic digital calibration, and shows status on LED bar indicator. Sensor responds in 80 µsec and supports detection at rates as high as 6,250/sec with 16-bit accuracy.