>Most of the discussion on this board seems to be related to hot
>air systems like http://www.zephyrtronics.com/home.html.

>The instructor at the local community college where I am taking
>assembly classes prefers a contact system like Metcal, which is
>what I am using in class.

When doing assembly I think you will find that either of these will be
suitable. The difference comes if you need to replace a semiconductor chip.
I think you will find that a hot air system will unsolder a chip easier than
a contact system.

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