Features: Precise handheld GNSS disciplined frequency counter with 40ps time resolution and built in GNSS clock for long term stability in time frequency measurements. Features 12 bit resolution, multi function measurements, and a 4 inch touch display with 4000mAh battery for portable operations. Designed for engineers and technicians requiring field testing, lab analysis, and ADEV measurements with clock grade external reference compatibility. Optimized for satellite synchronization, maintenance, and precisions timing applications requiring low error rates. Combines laboratory grade accuracy with portability, offering USB control, antennas connectivity, and user friendly timeLab software integration for advanced signals analysis. Specifications: Component: Plastic Input voltages: ±3.5V; 3.5Vpp or 16dBm (50Ω load) Power supply: 4000mAh battery Display: 4-inch touch display Pattern: 2 pattern optional Package Includes: 1 Set Frequency Counter note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.