The Martindale LM90 is a low cost light meter with a resolution of 0.01 Lux, making it suitable for general purpose use.
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The LM90 also features Peak Hold and Hold to allow maximum readings to be recorded, or one particular result to be kept. Results can be shown in lux or foot candles. Conversion factors for different light wavelengths are given in the handbook, to allow for more accurate measurements. The LM90 has four ranges, 20 lux, 200 lux, 2,000 lux & 20,000 lux and is more accurate on the higher ranges.