The model S471 High Performance Handheld Optical Meter is ideal for photometric, radiometric, laser power, and fiber optic measurements. Designed to be used in a laboratory setting or field environment, the microprocessor controlled architecture features direct analog display, serial RS-232 output and analog voltage output.

Our wide range of optical meters, photometric and radiometric sensors is complemented by ISO/IEC 17025 accreditation by NVLAP (NVLAP lab code 200823-0), resulting in unmatched performance and custom configuration as required.


  • Display Measurement
  • LED Measurement
  • Laser Power
  • Strobe & Signal Measurement
  • Lamp Testing


Precision Solutions for Photometric, Radiometric & Laser Power Measurement

  • Wide dynamic range
  • High accuracy measurements
  • Programmable average readings in low-pass or boxcar mode
  • Sample speeds up to 53 Hz(1)
  • Optional USB to serial bridge converter
  • Long battery lifetime or use external power


CONFIGURATION OPTIONS The S471 can be configured with a wide range of sensors and calibrations in units including:

  • Luminous Flux (lumens) or Radiant Flux (Watts),
  • Illuminance (lux, foot-candle) or Irradiance (W/m2 ),
  • Luminous Intensity (candela) or Radiant Intensity (W/sr),
  • Luminance (cd/m2 , foot-Lambert) or Radiance (W/m2 sr).

Sensor Options

Photometric Sensors (1)

Silicon Detectors 

Options include:  Standard Miniature, Low Profile, LED measurement sockets

Radiometric Sensors

Silicon, Germanium or InGaAs Detectors 

Options include:  UV Enhanced, Miniature, Low Profile, Flat Response, Blue Optimized

LED Measurement Head

Meets CIE Publication 127 Conditions A & B

High Precision and Quick-change mounts

Integrating Spheres

50 mm diameter mini-spheres with 5 mm entrance port

(1) The high accuracy of our photometric sensors begins with our world-class Photopic filters, featuring spectral matching to  f1’< 1%.




7 Gains, auto/manual selection

Electrical Accuracy

± 1.2%    ± 2 counts

Dynamic Range

9 1/2 decades


7.5 Hz

Measurement Modes

(sensor dependent)

Luminous Flux (lumen) or Radiant Flux (Watt)

Illuminance (lux, foot-candle) or Irradiance (W/m2 )

Luminous Intensity (candela) or Radiant Intensity (W/sr)

Luminance (cd/m2 , foot-Lambert) or Radiance (W/m2 ·sr)

Display Information

4.5 digits                2 Hz update rate                     Modes include Linear, Log and Analog (bar graph)

Computer Interfaces

RS-232 or USB with use of serial bridge adaptor (not included)

Sample Rates

18.9 msec               Update rate via RS-232        2 Hz with display enabled, 53 Hz with display disabled

Averaging Modes

Low-pass or Boxcar, programmable

Analog Output Scale

±  4 VDC

Communication Rate

9600 Baud

Operational Battery Life

16 Hours with backlight off, 12 Hours with backlight on

Operating Temperature

10 to 60° C

Storage Temperature

-20 to 35° C for up to 1 year

External Power Source

12 VDC at 3.3 A or 100-240 VAC 50/60 Hz with supplied power adaptor, 40 W max with 1 meter cable

Internal Power Source

Rechargeable integral batteries — 5 NiMH AA, 1800 mAHr batteries

Calibration Capacity

9 Continuous or 50 single-point

Calibration Traceability

Traceable to NIST with optional ISO/IEC 17025 accredited

Relative Humidity

Up to 99% (non-condensing)


234 mm (9.25 in) L x 114 mm (4.5 in) W x 36 mm (1.4 in) H             590g (1.3 lb)

Regulatory Compliance


Specifications are subject to change without notice.