... ,RS-232 Interface, Option GPIB Interface,USB Interface, MTBF> 20000h SP2281 DIGITAL RF POWER METER/MILLI-VOLT METERProduct Details:Feature:Controlled ... :5VTime base:10MHz Stability 5×10-6Size255mm×370mm×100mmWeigth3.5kg SP2281 DIGITAL RF POWER METER/MILLI-VOLT METER