The adapter received does not match the photo in the description. All RS-232 USB adapters are not created equal. Some Extech instruments require IC adapters. I thought if I paid three times more for the Extech brand I would definitely get one with the chip, instead the seller sent me a universal RS-232 USB adapter that I could buy for less than $10 and plugged the an additional $35. The one I received was translucent blue, not greenish blue as shown in the picture, and didn't have the "Extech" logo on it.
EXuby Digital Converter Box For TV With RF/Coaxial And RCA Cable For Recording And Viewing Full HD Digital Channels Free (Instant Or Scheduled Recording, 1080P HDTV, HDMI Output, 7 Day Program Guide)
12 Review
Dorhea LM2596 DC-DC Buck Converter Step-Down Regulator 4.0-40V To 1.25-37V DC 36V To 24V To 12V To 5V Volt Power Supply Module With LED Voltmeter Display Compatible With Car Motor Buck
16 Review
DC/DC 12V To 24V Boost Converter 40A 960W - Waterproof Voltage Regulator Module For Car Power Supply (10V-16V Input)
15 Review
HOMELYLIFE 600W High Power Voltage Reducer DC 48V 60V 72V Step Down To DC 12V 50A Buck Converter Waterproof Module Car Truck Power Regulator Transformer
12 Review