Wide Range: Measures 1-400,000 Lux (0.1Lux resolution). High Accuracy: 4% at less than equal 10,000 Lux, 5% beyond. Flexible Sensor: Detachable for hard-to-reach spots. Data Functions: Hold, max/min, and relative measurement. User-Friendly: Backlit LCD, auto-zero, and low battery alert. Product Parameter: Display Range: Maximum 3999 counts Measurement Range: 1-400,000 Lux Resolution: 0.1 Lux/FC Temperature Measurement: 0-40 Operating Conditions: 0-40 / 0-70% RH Storage Conditions: 10-50 / 0-80% RH Dimensions: 220x75x33 mm Weight: 250g Power Supply: 1 x 9V battery (Not included batteries) (about 5mA current consumption) Unit Switching: Lux/FC, / Modes: Auto/manual range, data hold, relative measurement Data Storage: Short REC to record, long to review history Perfect For: Photography: Perfect lighting setup for studios. Construction: -compliant workplace lighting checks. Plant Growth: Optimize greenhouse light levels. Color:Black & Blue Material:plastic Package Contents: 1 * Digital illuminance meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.