✅【High Precision】Featured with 3999 counts display, BTMETER digital luxmeter 5000A can test light Illuminance up to 400,000 Lux with 0.1 LUX/FC high resolution. Measure accuracy: +/- 4% of readings for ≤ 10000 Lux; +/- 5% of readings +/- 1.5% f.s for ≥ 10,000Lux and +/- 8% of readings +2.0%f.s for ≥200,000 Lux measure range. light measuring units lux and footcandles FC switchable. | ✅【3 Measure Modes】This ft candle light meter supports maximum, minimum, and real-time value measurement modes switchable, helping you to find the proper light level for indoor LED plant growing light , greenhouse farming, photography, reef tank and aquarium decoration easily. | ✅【Light Meter Recorder】Not only available to monitor light lux level, but also support light data logging up to 30 groups and allowing for easy review. One-button to freeze lighting measurement data. Useful light measurement tool in balancing optimal light levels for interior design, including art galleries, museum, schools and offices workplace etc. | ✅【Handheld Lightmeter】Digital luminometer BT-5000A supports automatic shutdown after 15 minutes of inactivity, HD backlight LCD display and low battery reminder. Capable to measure ambient temperature from -10℃~50℃ with the ability to switch between Celsius and Fahrenheit degree. Comes with practical cover design to protect the sensitive light sensor well for durability. | ✅【270° Rotatable Design】The luxometer has been calibrated to a standard incandescent lamp at 2556K, ensuring accurate readings across a variety of light sources. Separate light sensor can be rotated 90 degrees or 270 degrees to one side. Handheld luxmeter 5000A comes with 365 days quality warranty and lifetime technical supports.