... to CIE photopic Curve. Auto ranging from 0.05 to 7000 lumens. Accurate and Instant response. Data Hold function. Data memory ... digit LCD read outMeasuring Range9.999, 99.99, 999.9, 7000 lumens, Auto ranging (4 step)Overrange DisplayOL is displayedResolution0.001 ... 0.1 ±7%, 0.1 to 1000 ±1%, 1000 to 7000 ±3%Integrating SphereDiameter50mmSample pore12.7mm diameterCIE photopic f ’16%Temperature ...