TFA Dostmann 31.3000 Lux Meter

The TFA Dostmann 31.3000 is a professional lux meter with a measurement range of 0 to 200,000 lux, ideal for precise light level assessment in workplaces, photography, and horticulture. Its silicon photodiode sensor with CIE photopic spectral response approximates the human eye's sensitivity, ensuring reliable readings.

Advantages

The device offers high accuracy of ±3% rdg ±0.5% f.s. below 10,000 lux and ±4% rdg ±10 digits above, with a resolution from 0.1 lux in low-light conditions to 100 lux at high intensities. It features data hold, MAX/MIN recording, and an auto power-off function after 15 minutes of inactivity to conserve battery life.

Suitable for

• Workplace illumination audits
• Photography and studio lighting
• Greenhouse and indoor farming
• Museum and gallery light control

Key specifications

• Measurement range: 0 - 200,000 lux
• Accuracy: ±3% rdg ±0.5% f.s. (<10,000 lux), ±4% rdg ±10 digits (>10,000 lux)
• Resolution: 0.1 / 1 / 10 / 100 lux depending on range
• Sensor: Silicon photodiode with CIE photopic filter
• Display: LCD with backlight
• Functions: Data hold, MAX/MIN, auto power off
• Power: 1x 9V block battery (6F22), approx. 200 h battery life
• Operating conditions: 0°C to +40°C, 0% to 80% RH

Recommendations

For consistent measurements, allow the sensor to stabilize for a few seconds and avoid shading the photodiode. The cosine correction ensures accurate readings even at oblique light angles.