laser pointer
我想買一支laser pointer，大家用甚麼牌子？幾多錢?幾多mW？邊到買好? Red or green one?
Recently the blue laser pointer is coming into market, but it is extremely expensive!!!
Cheers,
Eric 紅色聽人講好難睇到。（因為波長較長，較不易散射）
我想，當住我弟弟要綠色先。
green laser
Green laser pointer is available in Ap Liu Street. The cheap ones costs slightly over HK$100. A good one with ~15 mW power and using 123-type lithium battery cost about $250.I recommend the one that uses Lithium battery because green laser isin fact a 2-stage system (unlike the red one which is just a simple laser diode,andconsumes little power) that consumes much larger power than the red ones.
PTS 想問下點選購laser pointer? 今日去左鴨記買左枝綠色laser。用鋰電，10mW，$180。多謝大家的意見。
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