Selecting the high quality linear actuator depends on several factors. Here are some steps you can follow to choose the right one:

1 Application  Provide details about the specific application for the linear actuator. Is it for industrial automation, robotics, home automation, medical equipment, or something else?

2 Load and force requirements Calculate the maximum load or force that the linear actuator needs to handle or lift. 

3 Stroke length  Measure the distance the actuator needs to travel,the closed or retracted length and open or extended length. 

4 Consider the speed requirements: Determine the desired speed at which the actuator needs to move. Different actuators have different speed capabilities, so choose one that meets your needs.

5 position signal feedback  Linear actuators typically offer different options for position feedback,such as potentiometer,Hall effect sensor,encoders and PWM and etc. The specific feedback method used in a linear actuator depends on factors such as the application requirements, precision needed, environmental conditions, and cost considerations.