300 MHz basic unit Ultra High Stability Oven: up to 5 x 10-9 within 10 min Battery supply in combination with Ultra High Stability Oven for On-Site calibration Displays 10 digits in a second Smart AUTO trigger eliminates guesswork, provides error-free measurements Analog Bar Graph displays signal strength and input sensitivity to assist instrument setup and RF tuning Options 53 = Very High Stability Oven Time Base (PM 9691) Battery Unit (PM 9623)