Luminous Transmittance Meter

product model TLV-304-LC


Quick check of transmittance with a value close to sensitivity of human eyes


  • Built-in photopic filter
  • One-touch calibration
  • Not affected by ambient light
  • Long lamp life
  • Remote control software
  • Judgment function

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Movie clips

TLV-304 Movie 1
figure TLV-304-LC Explanation

The TLV-304-LC is a compact transmittance meter with a correction filter which approximates to the luminosity curve. This unit quickly measures the transmittance with a value close to sensitivity of human eyes and allows easy measurement by placing a sample after one-touch calibration.
It is suitable for a quick inspection process to conduct large volume of measurements.

figure TLV-304-LC Optical Configuration

figure Temporal Luminosity Characteristics
Photo Sensitivity
  • Transparent conductive film glass
  • Film
  • Glass blank
  • Resin material
  • Filter glass
  • Eyeglass lens
Model TLV-304-LC
Photo sensitivity Approximation of photopic spectral luminous efficiency
Light source White LED
Display 4 digit digital display (xxx.x) Unit: %
Measurement reproducibility Within ± 0.5%
Measurement time 200ms
Distance between detector and light source Approximately 50mm
Beam diameter 6mm dia.
Sample size Min. 15mm dia.
Criteria for judgement function Green indicator (ON, OFF or Blink)
Input voltage AC100 - 240V 50/60Hz (Input range: AC85 - 264V)
Apparent power Less than 7VA (AC100V/50Hz)
Remote control RS485 *The cable is optional.
Recommended environment Temperature 10 - 35 deg C
  Humidity less than 70% *Avoid condensation
Dimensions 150(W) x 204(D) x 213(H)mm
Weight 2.9kg