Look directly down at the meter face to avoid parallax error.

: Open the battery door on the back to install a fresh 1.5V AA battery. A battery is only required for measuring resistance; voltage and current readings do not need power.

Caution: Never measure resistance on a live circuit. Turn off all power and discharge all capacitors before proceeding.

Replace the single AA battery, paying close attention to the polarity markings (+/-).

Never measure resistance on a live circuit. Always disconnect power and discharge all capacitors before taking resistance readings.

range. Beside the diagram of the probes, there was a faint pencil mark near the 20V setting. Elias remembered then—the summer of '88. His father had used this exact meter to teach him how to test the batteries in his remote-controlled car.

The Micronta 22-212 is a classic, pocket-sized analog multimeter sold by RadioShack during the peak era of DIY electronics. Known for its compact "fold-up" or "clamshell" case design, this test instrument remains a favorite among vintage electronics hobbyists, ham radio operators, and casual DIYers.

Separate the probes and touch them across the component or resistor you want to measure. Read the top scale from right to left. 5. Maintenance and Battery Replacement

Connect the test leads to the meter (Black to , Red to + ).

The maximum current measurement capacity is 150 milliamperes (mA) DC. Do not use this meter on high-current household AC circuits.

RX10, RX1K (Center scale is approximately 3.7) Understanding the Front Panel and Controls

Before turning the meter on or connecting leads, look at the pointer needle. It should rest exactly on the "0" mark on the far left of the scale. If it does not, use a small flathead screwdriver to slowly turn the plastic screw located in the center of the meter face until the needle aligns with zero. 2. Measuring Voltage (AC or DC) Plug the black test lead into the (negative) jack. Plug the red test lead into the V-Ω-A (positive) jack.

When the meter can no longer be adjusted to zero on the Ohm scale when the probes are touched together, the internal battery is weak. Remove the screw on the back cover of the multimeter. Carefully separate the front panel from the back housing.

Mirrored scale to eliminate parallax reading errors, mechanical zero-adjust screw, and a built-in tilt stand. Front Panel Layout and Controls

The is a vintage analog 8-range multitester originally sold by RadioShack . While a direct PDF for the exact 22-212 manual is rare, its operation is nearly identical to other vintage Micronta models like the 22-210 or 22-204C . Key Specifications & Features Ranges : 8 total measurement ranges. DC Voltage : 15V, 150V, 1000V (2000 ohms/Volt sensitivity). AC Voltage : 15V, 150V, 1000V. DC Current : Up to 150mA. Resistance : Up to 100k ohms (Center scale 3.6k ohms).

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