About the article

LED Light Pen

LABSPROJECT
Based on a Labs project | October 2011 | Find it here
Physicians and repair engineers often use small light pens for visual examination purposes. Rugged and expensive as these pens may be, their weak point is the bulb, which is a ‘serviceable’ part. In practice, that nearly always equates to ‘expensive’ and / or ‘impossible to find’ when you need one.
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