RADIO SHACK Smart2 Model 22-175B (AKA: Micronta 22-175B) - Digital Multimeter

Circa 1992 to 1994

A true RMS digital benchtop multimeter. It was designed as a "serious" entry-level lab instrument, offering advanced features in a compact, portable housing.

Use Cases:

This multimeter is used for precise electrical measurements where standard "average-responding" meters might be inaccurate, particularly on non-sinusoidal waveforms.

• Electronics Design & Prototyping: Ideal for hobbyists and engineers needing to measure transistor gain (hFE), capacitance, and frequency on a stable benchtop platform.

• Audio Equipment Repair: The True RMS capability is critical for accurately measuring AC signals in audio amplifiers and power supplies.

• Component Sorting: Features dedicated front-panel slots for directly inserting and testing diodes, capacitors, and transistors without the need for test leads.

• Field Service: While built as a benchtop unit, its lightweight design and integrated handle/stand make it suitable for on-site industrial maintenance.

Historical Significance:

The 22-175B is significant as one of RADIOSHACK's most capable and well-built digital meters of the 1990s. It brought True RMS and (hFE) testing to a consumer-accessible price point, bridging the gap between basic handhelds and expensive professional bench meters from brands like FLUKE or HP. It is remembered for its durability, with many units still functioning accurately over 30 years later.

Included Accessories:

• Test Lead Set.

(H-7cm x W-18.5cm x D-12cm)