How to get the insertion loss less than 0.15dB.Especially APC Type。

we know the huge effect of APC ferrule angle and ferrule concentricity when you test the insertion loss. 

but ignore the quality of connector kits. sometimes, we control the angle's tolerance. let the tolerance 

from +/-0.5dregee to +/-0.3dregee. or used a 0.5um or 0.3um concentricity ferrule. 

there's a good choice. but get the angle's tolerance +/-0.5dregee. it's a challenge. for the polish dish or the polish machine.

Now LUCOTEK let this issue is simple.  only use our connector kits. also can get less than 0.15dB attenuation.