Lock in an accurate exposure with the exceptionally portable Lumu Light Meter, a simple module that connects directly to your iOS device via the 3.5mm headphone jack. This incident meter is compatible with iOS 8.2 and later and utilizes a digital silicone photodiode along with a hemispherical cardioid-type diffuser and silver stainless steel body to measure ambient light. It offers a wide measuring range of 0.15-250,000 lux, or EV -4 to 20 at ISO 100, and has a rated repeat accuracy of 0.1 EV. Additionally, it does all this with minimal power draw from your device.
In order to optimize usage for your applications, the free Lumu Light Meter app for iOS is available for download. Features include illuminance measurements, photo ambient exposure, spot metering, and more.
This meter is very convenient, coming in at just 0.94 x 0.78" in size, and it has 0.09" of free space between it and the device in order to remain bumper-proof. Also, it comes with a storage pouch to ensure your investment is safely put away.