Feature: 1. 1. LCD Backlight Display: LCD display with backlight for easy operation in darkness. 2. 2. Practical Functions: Support data hold / Max / Min / temperature unit selection ( ℃ or ℉ ) / unit selection ( Lux or FC ). 3. 3. Ambient Humidity and Temperature: In addition to measure visible light, it can measure the environment humidity and temperature. 4. 4. Compact Size: Mini lux meter with stable, safe and reliable measurement. Light and compact, so you can hold and carry it conveniently. 5. 5. Auto Power Off: The meter has an automatic power off feature that conserves battery energy. After 10 minutes the meter automatically shuts off. Specification: The product is a lx meter. Visible light emitted by fluorescent lamp, metal halide lamp, high voltage lamp or LED lamp can be measured. Specifications: Model: HT603 Display: LCD Color: Black and Red Shell Material: ABS Light Measurement: Range: (LX) 1000/10000/200000, (FC) 100/1000/20000 Accuracy: 2854°K LED lamps: ±(3%+5 words) Other: ±(6%+5 words) Temperature Measurement: Range: -20.0℃~60.0℃ (-4.0℉~140.0℉) Accuracy: 0.0℃~45.0℃ (32℉~113℉): ±1.0℃/2.0℉ Other: ±1.5℃/3.0℉ Humidity Measurement: Range: 0.0% ~99.9%RH Accuracy: 20%~80%: ±5.0RH Other: ±6.0RH Cosine Angle Deviation Characteristics: 30°±2%, 60°±6%, 80°±25% Sensor: Silicon photo diode and spectral response filter Operating Conditions: Temperature: 0～40°C, Humidity: <80%RH, Altitude: <2000m Storage Conditions: Temperature: -10～50°C, Humidity: <80%RH Sampling Rate: Approx. 2 times per second Spectral Range: 320～730nm Auto Power Off: 10 minutes Power: 3 x 1.5V AAA batteries ( not included ) Item Size: 14*5.8*2.6cm / 5.51*2.28*1.02in Net Weight: 140g / 4.94oz Packing Size: 18.5*9*5.5cm / 7.28*3.54*2.17in Packing Weight: 212g / 7.48oz . Package List: 1 * Digital Lx Meter 1 * Cloth Bag 1 * Manual ( English ) Note: 1. Due to manual measurement, the size may be slightly different. Thank you for your understanding. 2. Due to different light conditions and different monitors, item color displayed in photos may be showing slightly different from real object.