Universal LightProbe S2 Ultra-High Sensitivity Sensors are designed for the test of very dim LEDs, as low as 0.01 mcd minimum, and including very low light-level LED-illuminated action-indicator switches, controls and status indicators for night/dark viewing in automobile interiors. Recommend the use of wide-aperture stainless- steel encased Fiber- optic Probes with contacting tips.Operating temperature range: 0oC to 70oCPower consumption: Operates between +5 and 28 volts D.C., at 6mA max. Less than 4.75 volts is not recommendedVoltage protection: Withstands up to +40 volts, & reverse polarity to -18 voltsSignal Output Loads: 20 mA max. Non-inductive.Output Pins: 3 gold-plated standard wire-wrap pins (0.025 in. sq.)Sensor Size: 0.560 in. dia x 1.38 in. long.Typical response times: <190mSFiber-Optic Probes: Wide-Aperture Fiber-Optic Probe recommendedDesigned for the test of very dim LEDs, as low as 0.01 mcd minimum