Features: The Digital Analog Servo Tester features three adjustable modes and 50Hz 250Hz frequency switching, coupled with a real time display for remote servo calibration and dynamic testing in model aircraft systems. This multifunctional electronic speed regulator offer 900-2100µs width control via potentiometer adjustment, supports 4.8 6.5V input, and provides auto mode testing with variable rates for comprehensive device diagnostics. Designed for hobbyists, drones builders, and aviation technicians requiring servo motor testing, frequency synchronization, and electronic speed controller calibration. Ideal for bench testing aircraft servo responsiveness in workshops, field calibrating drones motor systems during outdoor, or troubleshooting synchronization issues across 50Hz/125Hz/250Hz frequency dependent devices. Built with plastic metal housing and PCB circuitry, this compact servo tester integrates manual override controls with automated cycling functions, ensuring stable output across extreme 900 2100µs ranges for prolonged equipment validation tasks. Specifications: Component:PCB+Metal Input: 4.8-6.5V Output width: 900-2100us Output frequency: 50Hz/125Hz/250Hz Size: Approx.7.3x3cm/2.87x1.18inch Package Includes: 1 Set Model Aircraft Servo Tester note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.