• Dimensions (H x W x D), 144mm x 90mm x 30mm (5.6" x 3.5" x 1.2”)
  • 165g (5.8oz) excluding batteries
  • 16x2 OLED display for easy viewing
  • Fast response, and low power consumption
  • Operating temperature from 5 to 50 Celsius (41 to 122 Fahrenheit)


  • 2 x AA (LR6) batteries/ rechargeable batteries
  • Reverse battery protection
  • 50 hours of continuous operation on standard AA batteries
  • A tiny current of less than 0.1 micro amps is used when off.  Even so when not being used for a while it is always best to remove the batteries
  • Auto shutdown when batteries become too low to maintain accuracy


  • Measurement of audio visual delay up to ±750 milliseconds
  • Display is rounded to the nearest 1 millisecond or 1/100th of a frame, internal timing resolution of 0.05 milliseconds between light and sound pulse
  • Self calibration adjusts for ambient noise and light, including fluorescent light flicker
  • Automatic microphone gain adjustment during calibration process