2-in-1, with two dials that can display brightness and temperature. High precision sensor, quick test in 04 seconds. Small size, easy to carry. No battery required. Pointer light meter, thermometer Light measurement range: 0-250,000LUX Temperature measurement range: -20-50 -10-130 Resolution: 1uW/cm, 0.01mW/cm Accuracy Light: -/+10% -/+5% Sampling time 0.4 seconds. Application range: working environment (lamp light intensity), plant light, ambient temperature Working environment: -20-50 7.Scope of application: work environment (Luminaire illumination intensity),Plant illumination, amblent temperature. This product does not require batteries. Illuminance: Optimal value: 200,000 lux-300,000 lux (In this range, the light is not glaring and bright, so bright that your mood is also sunny) Temperature: Optimal value: 23 degrees-28 degrees(Scientifically proven to be the most suitable and comfortable temperature for the human body) Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Photo Color Material:plastic Package Contents: 1 x 2 in 1 Light Meter portable Thermometer 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.