ZWO Electronic Automatic Focuser - Warranty and Return Policy

EAF Manual
EAF_Manual_EN_V2.5.doc
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Set the number of steps in the Set Backlash settings box
If you want to measure the backlash setting more accurately then
chose Step Size 5 in the fine step setting and repeat the above
steps.
10. Warranty and Return Policy
We provide 2-year warranty for our products.