MT3608 boost converter not working

I got a pair of MT3608 boost converters a while back and I decided to give them a test to see if they can work.

I initially tied the positive and negative wires of a 9v snap connector and tested my 9v with my multimeter (finally figured out how to correctly use that!) and it showed the regular voltage. But when I tried to adjust the screw on the size to increase the output, nothing happened. I looked up the videos online of people using these and I don't see what I am doing wrong. Turning the screw in any direction does nothing.

I will show the pictures of how the module is wired up.

 

Sorry, here are the pics:
https://imgur.com/z13KVva
and
https://imgur.com/VaFayBL

 

Nevermind. I figured out what I did wrong. I need to turn the screw to adjust the output before attaching the battery. I fixed it. I can get a full range of voltages.



Should have paid more attention to the video.

 

Actually you are right. I don't know what happened exactly. But either way it now works like it should so I am not worried.