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What kind of code are the markings on the resistors in the picture?

I think they write out the Omega symbol, just because there is enough space on the component and looks nice, but I was not able to find any matching result online about the meaning of the letter 'F' and 'J'.

What kind of marking system is it?

smd

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  • \$\begingroup\$ Could be a date code, lot code, manufacturing site code, etc. \$\endgroup\$
    – John D
    Commented Jul 12, 2020 at 18:30

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One likely option is tolerance code. F = 1% and J = 5%.

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