Dual-Platform...Remote Control...Ultimate Flexibility...The Sekonic Spectrometer C-4000 combines precision light measuring technology, renowned in the industry with the flexibility and convenience of smartphone technology. Designed specifically for the lighting designer and field technician in mind, the C-4000 Spectrometer offers a compact, lightweight, sophisticated and affordable solution for the lighting professional.With its 2.7" color touch screen, Bluetooth enabled wireless communication and compatibility with Apple and Android smartphone/tablet, the C-4000 offers the most flexible and real time on-location data sharing than any other system in the market today. The C-4000 offers standalone basic numeric reading from the meter, wireless remote measurements via the free Sekonic Ld App and smartphone/tablet or advanced Sekonic Ld paid App offer extensive functions including plot measurements.