Supply used FLUKE PM6690 high precision frequency meter 13-bit readout product name: high precision frequency meter instrument brand: Fluke instrument model: Fluke PM6690 instrument origin: USA, shenzhen Chengheng Electronic Instruments Co. , Ltd. has long recovered used oscilloscopes, Network analyzer, integrated testing equipment, Bluetooth testing equipment, data acquisition equipment, signal analysis equipment and other instruments, recycling closed factories, function description input range: 300MHz, 1.3 ghz, 2.7 ghz, 4.2 ghz optional numbers: 10 high-stability reference time base per second: 5 × 10-10/24 hours automatic trigger: Intelligent Human Guess: eliminate measurement errors: prevent signal strength: analog bar display settings and radio frequency tuning (RF-RRB- : assist with instrument input