Test Together: can be synchronized output control 4 servos.Accurate Test: used to compare the performance steering control of the steering output signal can be accurate to 2us (1 milliseconds = 1000 microseconds), you can test the steering is able to respond to subtle changes.PPM Signal: with PPM signal test function in the display, the input PPM signal changes while the input the PPM signal synchronization output to the Energized automatically enter manual mode (Manual) 20us 50H analog signal cycle, frequency 50Hz.Adjustable: potentiometers to decrease or increase the width of the output pulse.3 Modes:S-1 manual mode (Manual)/S-2-bit mode (Neutral)/S-3 automatic mode (Automatic)Mini 3 Modes Digital /ESC Consistency Tester Steering Measurement for RC Helicopter Airplane Car Steering tester1This Digital Tester is with high accuracy.2You can test control 4 servos at the same time and change the test modes as you need.3With potentiometers, you can decrease or increase the width of the output pulse.colour:blackMaterial:ABSsize:40*75*25MMPackage Contents:1* testerNotice:Carefully read the before any use, if you are a beginner, it/'s advisable to be assisted by an experienced adult.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.