A secondary display below the digital readout shows input magnitude relative to the full-scale range, similar to an analog needle. Data Hold:

If you cannot find a clean download, keep reading—this article will walk you through all 24 ranges as if you had the original document open.

Disclaimer: This guide is for informational purposes. Always exercise caution when working with live circuits above 50V. The author is not affiliated with Radio Shack or its successors.

To measure current up to 20A, the red lead must be moved to the specific high-current (20A) jack .

The RadioShack 24-Range Digital Multimeter (Model 22-805) remains a staple tool for electronics hobbyists, DIYers, and technicians. Known for its reliability and straightforward interface, this classic pocket-sized test tool is highly versatile.

: If the meter fails to measure current, check the internal fuses. Always disconnect the test leads and turn off power before opening the back cover. Internet Archive Manual Resources

Full text of "radio shack meters support 64777" - Internet Archive

Select the appropriate range. For current under 200mA, use the V/Ω/mA jack. For current up to 10A, move the red probe to the 10A jack. Connect the meter in series with the circuit path.

For those who want to know the technical details, the manual lists the specifications of the multimeter, including its accuracy, input impedance, and operating conditions.

One of its most distinctive features is an RS-232 serial port , which allowed users of the era to connect the meter to a PC (running MS-DOS or Windows 3.1/95/98) to log and graph measurements.

Plug the black (negative) test lead here for all measurements.