The PH20 probe holder has a non-polar indexing positioning function, which breaks through the small indexing limitation of traditional mechanical positioning probes, achieves precise angle positioning, and eliminates the unlocking and locking process during the rotation of traditional mechanical positioning probes, increasing the rotation speed of the probe several times. PH20 is particularly suitable for applications that require frequent changes in the angle of the measuring head during the measurement process, as well as situations that require high measurement efficiency.