The Light Meter TES 133 uses special optic filters to reconstruct the exact response of the human eye to light intensity. Light Meter Luminous Flux Meter TES-133 The Light Meter TES 133 uses special optic filters to reconstruct the exact response of the human eye to light intensity. A light measuring cell in the meter (photo diode) converts incident light into an electronic signal that is read and displayed on the meter’s LCD Features: 4-digit LCD reading. Spectral Sensitivity close to CIE photopic Curve. Auto ranging from 0.05 to 7000 lumens. Accurate and Instant response. Data Hold function. Data memory and read function. Zero function. Ratio function. Sort function. Comparator function. Best for measuring : LEDs, Small lamps, Fiber illuminators. Auto power off function. RS232 Interface. Easy to use. Adapters kit : 2/3/4/5/8/10m/m Specification: Measuring Range: 9.999, 99.99, 999.9, 7000 lumens, Auto ranging (4 step) Accuracy: 0.05 to 0.1 ±7%, 0.1 to 1000 ±1% Resolution: 0.001 lumens Power Source : 6 pcs AAA size Battery Light meter Lux meter TES TES-133 à¤Ã×èͧÇÑ´¤ÇÒÁà¢éÁáʧ à¤Ã×èͧÇÑ´áʧ