Who has experience with OLTS ?

[Tagir Temirgaliyev]

OLTS looks like cheap device to measure optical attenuation. 

Is it worth buying it and using it at work with SM cables?

[Leo Laohoo]

Get an OTDR instead.

[Tagir Temirgaliyev]

thank you Leo, otdr is better I know, but more expensive, some several thousands dollars

[Leo Laohoo]

OLTS will only say there is a signal loss.  An OLTS will not say WHERE or HOW FAR is the fault. 

An OTDR can say, yes, there is a signal loss and the fault is X distance away.  

[Tagir Temirgaliyev]

thank you Leo, I know how to work with OTDR, I did it many times. but now I dont have it. I see I can order OLTS from aliexpres for about 20 dollars. is it good choice?

[Tom Randstrom]

The OLTS is a handy piece of test gear to have (or separate power meter and light source) for confirming continuity and loss of a fiber link.  Can't comment on a specific product sold on AliExpress, but it may be sufficient for your testing needs. 

[Tom Randstrom]

The website, thefoa.org, provides understandable information regarding testing fiber optic cabling.