Radio Shack 24 Range Digital Multimeter 22-805 Manual Jun 2026

But today, the red-and-black plastic casing of the 22-805 is easy to find in estate sale junk boxes. The manual , however? That’s the holy grail.

A continuous beep indicates a solid, unbroken electrical path. 4. Measuring DC Current (Amps) Turn off the circuit power. Insert the black lead into .

The RadioShack 24 Range Digital Multimeter 22-805 offers the following measurement functions and ranges:

: Includes an analog bargraph display alongside the digital readout to show the magnitude of input relative to the full-scale range.

: A dedicated button holds the displayed value so you can read it after removing the probes. radio shack 24 range digital multimeter 22-805 manual

The RadioShack 24-Range Digital Multimeter (Catalog Number 22-805) is a classic, reliable workhorse from the golden era of hobbyist electronics. Whether you found one in a garage sale, inherited it from a fellow maker, or dug your old unit out of storage, this multimeter remains highly functional for testing household circuits, automotive electronics, and benchtop projects.

: Rated for CAT II (600V) applications, providing protection against transient overvoltage spikes in household appliances and bench electronics.

Most users lost the manual because they assumed it was obvious. It’s not .

The core of the manual is the operating instructions. It provides step-by-step guides on how to measure DC and AC voltage, DC and AC current, resistance, and check for continuity. But today, the red-and-black plastic casing of the

: A visual representation of measurements relative to the full-scale range.

Incorrect readings or a fading LCD usually point to a low battery. Replacing the Battery Turn off the multimeter and disconnect both test leads. Remove the screws from the back cover of the housing. Carefully lift off the back cover.

Proper care prevents damage to the meter and protects you from electrical shock. Safe Practices Never measure voltages higher than 1000V DC or 750V AC.

According to the owner's manual found on the Internet Archive : Up to 1000V. AC Voltage: Up to 750V. Current (AC/DC): Up to 20A. Resistance: Up to 40 MΩ. A continuous beep indicates a solid, unbroken electrical

If you keep the 22-805, If you buy a new meter, keep the Radio Shack unit as a backup.

Use the RS-232 port to connect to a PC. It is supported by open-source software like sigrok for data analysis.

Turn off all power to the circuit being tested. Discharge any large capacitors. Turn the rotary switch to the desired range.