▁of ▁the ▁dot ▁of ▁light ▁em itted ▁by ▁the ▁reader . ▁If ▁this ▁dot ▁of ▁light ▁is ▁wider ▁than ▁any ▁bar ▁or ▁space ▁in ▁the ▁bar ▁code , ▁then ▁it ▁will ▁overlap ▁two ▁elements ▁( two ▁spaces ▁or ▁two ▁bars ) ▁and ▁it ▁may ▁produce ▁wrong ▁output . ▁On ▁the ▁other ▁hand , ▁if ▁a ▁too ▁small ▁dot ▁of ▁light ▁is ▁used , ▁then ▁it ▁can ▁mis inter pret ▁any ▁spot ▁on ▁the ▁bar ▁code ▁making ▁the ▁final ▁output ▁wrong . ▁ ▁The ▁most ▁commonly ▁used ▁dimension ▁is ▁ 1 3   th ou ▁( 0 . 0 1 3   in ▁or ▁ 0 . 3 3   mm ), ▁although ▁some ▁sc ann ers ▁can ▁read ▁codes ▁with ▁dimensions ▁as ▁small ▁as ▁ 3   th ou ▁( 0 . 0 0 3   in ▁or ▁ 0 . 0 7 5   mm ). ▁Most ▁manufact ur ers ▁advert ise ▁bar ▁code ▁resolution ▁in ▁mil , ▁which ▁is ▁inter change able ▁with ▁thou . ▁Sm aller ▁bar ▁codes ▁must ▁be ▁printed ▁at ▁high ▁resolution ▁to ▁be ▁read ▁accur ately . ▁ ▁See ▁also ▁▁ ▁C ue Cat , ▁a ▁cat - sh aped ▁hand h eld ▁bar code ▁reader ▁▁ ▁Bar code ▁Batt ler , ▁a ▁port able ▁game ▁console ▁which ▁sc ans ▁bar codes ▁as ▁part ▁of ▁the ▁game play ▁▁ ▁Bar code ▁for ▁more ▁details ▁about ▁the ▁Bar code ▁technology ▁ ▁References ▁▁ ▁Category : American ▁invent ions ▁Category : Autom atic ▁identification ▁and ▁data ▁capture ▁Category :