Several websited sell Tektronix equipment including Tektronix
itself. The Tektronix website is http://www.tek.com/ All of their
products are available to purchase through their website.
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Tektronix tds is a type of digital storage oscilloscope. The
digital design allows one to see signals. One can see the
measurements and readings at a distance or using the USB connect to
a computer. One can easily read and review the test signals.
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The brand Tektronix does have a line of multimeters. Each
multimeter varies by digital resolution.