Sekonic L-398A Light Meter Studio Deluxe III (401-399) ONLY SEKONIC METERS THAT ARE SHIPPED BY AND SOLD BY AMAZON.COM OR OTHER AUTHORIZED SEKONIC DEALERS CAN ENSURE THAT YOU ARE RECEIVING GOODS THAT HAVE PROPER FCC COMMUNICATION AND ARE COVERED BY A USA WARRANTY.THE AMAZON OFFER MAY BE SEEN TO THE RIGHT. GREY MARKET SEKONIC METERS WILL NOT APPLICABLE FOR A US WARRANTY. Ideal prime or back-up meter for still photography and cinematography use Amorphous photocell requires no batteries or external power source. ISO range 6 to 12,000 in 1/3 step increments 60-seconds to 1/8000th, f/0.7 to f/128, 8-fps to 128-fps