【Professional LED Light Meter】: LED light meter measures fluorescent, incandescent and (up to 400,000 lux) lamps, ensuring perfect brightness every time; 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 | 【High Accuracy】Measuring range: 1-400,000Lux. Resolution: 0.1LUX/FC Accuracy:≤10000Lux: +/-4% rgd+/-1.0% f.s. ≥10,000Lux: ±5% rgd+/-1.5% f.s ≥200,000Lux: +/-8% rdg+/-2.0%f.s). Automatic shutdown, data retention, unit adjustment, etc | 【270 Degree Rotatable Detector】Using silicon filter diodes, the light sensor can be rotated 270°, so you can measure photometric intensity from different angles without turning the light meter. Just rotate the sensor and you can still read the front illumination | 【Light Meter Recorder of 30 Groups】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 forLED grow lights, gardens, plants, schools, offices, countries, LED lights, indoor and outdoor etc | 【Tripod Mounting Hole】: Free your hands, thanks to the screw base design, this LED light meter can be placed on a tripod for hands-free use. Digital luminometer AP-5000A supports automatic shutdown after 15 minutes of inactivity, HD backlight LCD display and low battery reminder