Martindale LM90 Lux Light Meter

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This light meter LM90 from Martindale resolves down to 0.01 lux making it ideal for use in very low light applications.

The handbook gives details of conversion factors for different light wavelengths allowing more accurate measurements.

The peak hold and the hold functions allow a maximum reading to be recorded or one particular result to be kept.

You can set the Martindale LM90 Lux Meter to show results in lux or foot candles.

Martindale LM90 Light Meter key features
• Low battery indication
• Peak / hold function
• Lux and foot candles measurement units
• Includes battery, carry case and user manual

Martindale LM90 Light Meter technical specifications
• Photometric Formulas: 10.764 foot candles = lux(lumens/meter2) 0.0929 lux = foot candles (lumens/foot2)
• LM90 Range: 20lux, 200lux, 2000lux, 20klux, 20fc, 200fc, 2000fc, 20kfc
• Resolution: 0.01 lux, 0.01 fc (LM90)
• Spectral response: CIE photopic
• Acceptance angle: ƒ'2<3% cosine corrected (150°)
• Total accuracy for CIE standard illuminant A (2856K): ±(3%rdg + 10dgts)
• Display: 3½ digit liquid crystal display (LCD) with maximum reading of 1999
• Over range: (OL) is displayed
• Measurement rate: 2.5 times per second, nominal.
• Operating Environment: 0°C to 50°C (32°F to 122°F) at< 70% relative humidity
• Storage Temperature: -20°C to 60°C (-4°F to 140°F), 0 to 80% R.H. with battery removed from meter
• Accuracy: Stated accuracy at 23°C ± 5°C (73°F ± 9°F), <70% relative humidity
• Temperature Coefficient: 0.1x (specified accuracy)/°C (<18°C or >28°C), 0.056x(specified accuracy)/°F(<64.4°F or >82.4°F)
• Backlight display: yes
• Battery: Standard 9V battery (NEDA 1604, IEC 6F22 006P)
• Battery Life: 200 hours typical with carbon zinc battery
• Dimensions: 190mm(H) x 65.5mm(W) x 35mm(D)
• Weight: 210g including battery