Features 1、LCD Backlight Display: LCD display with backlight for easy use in darkness. 2、Practical Functions: Support data hold / Maximum / Min / temperature unit selection ( ℃ or ℉ ) / unit selection ( Lx or FC ). 3、Ambient Humidity and Temperature: In addition to measure visible light, it can measure the environment humidity and temperature. 4、Compact Size: Mini lx meter with stable, safe and reliable measurement. Light and compact, so you can hold and carry it conveniently. 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 )