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1.新增“光的相关知识点”，包括关于光通量，发光强度，照度，亮度，色温等的介绍，让您对于光的知识点有全面了解。
2.bug修复
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Light Meter is an easy-to-use, functional light intensity (lux) meter
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Stopwatch Timer is an application for a precise time measurement.
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Use your device's sensor to measure light intensity with high accuracy.
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Measure Light Intensity
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Measure light intensity accurately for photography, design, and daily use.
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40+ everyday tools: compass, ruler, calculator, timer, QR scanner and more.
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Sound Meter will measure the sound volume in your surroundings.
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Turn your smartphone in a real and professional Lux Meter.
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battery info, storage cleaning, and malware protection
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Measure light intensity with a lux meter and illumination analyzer
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Decibel Meter, SPL Meter & Noise Analyzer
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Bubble & Spirit Level will measure the slope of any surface in all directions.
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Professional sound level meter and noise detector for your android phone
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Detect hidden spy cameras and listening devices using DetectIT Device Detector
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Vibration Meter registers levels of vibration and directions of shaking.
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Decibel (dB) noise meter, sleep sounds, hearing test, meditation, focus timer.
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Protractor & Angle Gauge is a great tool for measuring any angle or slope.
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Professional light intensity Lux meter
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Sound level meter ( dBa, dBc) with spectrum analyzer & calibration.
