Frequency in the range of 10Hz to 18.0GHz is read directly from a 12-digit LED display which is sectionalized into GHz, MHz, kHz and Hz making it easy to make measurements quickly and accurately. Band 1 is from 10Hz to 100MHz (sensitivity of 25 mV rms) with 1Mohm impedance (BNC). Band 2 is from 10MHz to 1.0GHz (sensitivity of -20 dBm) with 50-ohms impedance (BNC). Band 3 is from 1.0GHz to 18.0GHz (sensitivity: -30 dBm from 1.0GHz to 12.4GHz; -25 dBm from 12.4GHz to 18.0GHz) with 50-ohms impedance (TYPE N). Time base crystal frequency is 10MHz with an aging rate of <3 x 10-E07/month, 10MHz square wave (1 V p-p minimum into 50-ohms) output is available. Overall accuracy is ±(1 count + time base error). Other features include: Test function (allows for front-panel diagnostics), Sample Rate control (variable from 100 ms to 10 sec), Reset control (resets display to zero and initiates new reading).