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Oscilloscopes are commonly used to observe the exact wave shape of an electrical signal. Oscilloscopes are usually calibrated so that voltage and time can be read as well as possible by the eye. This allows the measurement of peak-to-peak voltage of a waveform, the frequency of periodic signals, the time between pulses, the time taken for a signal to rise to full amplitude (rise time), and relative timing of several related signals.

Oscilloscopes are used in the sciences, medicine, engineering, and telecommunications industry. General-purpose instruments are used for maintenance of electronic equipment and laboratory work. Special-purpose oscilloscopes may be used for such purposes as analyzing an automotive ignition system, or to display the waveform of the heartbeat as an electrocardiogram. Some computer sound software allows the sound being listened to be displayed on the screen as by an oscilloscope.

~Wikipedia 

For more information on Oscilloscopes: http://en.wikipedia.org/wiki/Oscilloscope

FOR Oscilloscope probing options please see PROBES

Incorporated in 1970, Extech Instruments is based in Waltham, Massachusetts USA, just west of Boston. Recognized for the breadth and depth of its Test & Measurement offering and strong distribution network, Extech was acquired by FLIR Systems in November 2007. Extech Instruments’ high-value, handheld test instruments and FLIR-branded infrared thermal imager are sold through a network of national catalog houses, regional stocking distributors, internet, and international master distributors. The company has become one of the largest manufacturers and suppliers of test equipment and portable printers and the Extech Instruments brand is regarded in many industries as the brand of choice. ISO 9001:2000 certified by TUV, Extech’s enviable reputation is built on innovative products that offer unique and patented designs with features, functions and reliability at an affordable price.