As a professional instrument for measuring luminosity and brightness， this Smart Sensor AS823 Split Type Digital Illuminometer Luxmeter (Battery Not Included) is surely what you need now. You can feel assured to take it for its compact style and powerful functions， such as conversion of luminosity unit and max/mini value， LCD display with backlight， data hold function， battery and over-load indication， auto/manual shut-off function， low battery display， max/min/dif measurement mode selection， etc. Cast the old or out-of-fashion meter away and choose our illuminometer here!                                    Features             Conversion of luminosity unit and max/mini value， data hold function<br> Battery and over-load indication<br> Auto/manual shut-off function<br> Low battery display<br> Max/min/dif measurement mode selection<br> Split type， convenient to use and operate<br> LCD display with backlight， easy to read<br> A professional instrument for measuring luminosity and brightness   <br>                                                            Specifications             Model     AS823    <br> Measurement Range     1 - 200，000 Lux    <br> Temperature Range     -10℃ - 50℃(14℉ - 140℉)    <br> Measurement Accuracy     ≤10000 Lux， ±4%rdg±10; ≥20000 Lux， ±5%rdg±10    <br> Resolution     1 Lux， 0.1℃    <br> Operating Temperature     -10℃ - 50℃    <br> Working Humidity     10%RH - 90%RH No Condensation    <br> Sampling Frequency     2 Times/ Sec    <br> Repeatability     ±2%    <br> Power Supply     9V 6F22 Battery    <br> Storage Temperature     -10℃ - 55℃    <br> Storage Humidity     10%RH - 90%RH No Condensation    <br> Dimensions     (6.22 x 2.48 x 1.18)" / (15.8 x 6.3 x 3)cm (L x W x H)    <br> Color     Black & Gray    <br> Weight     8.18oz / 232g     <br>                                                             Package Includes            1 x Digital Lux Meter<br>1 x Certificate of Calibration<br>1 x Manual<br>