Ed Treese, a contract engineer in Kansas City, notes that a digital camera can also be a very useful tool. Even the camera on a cell phone is better than nothing, but higher resolution cameras can be helpful as well. Treese uses his camera to document damaged parts, make notes of an assembly before it is taken apart, and even as a way to see something obscured from view, such as the inside of a transmitter tube chimney or in Treese's recent case, the information from an air conditioner air compressor that was inaccessible for his eyes.

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