The original user manual for the 22-212 includes bold safety text. Ignoring it can destroy the meter or cause injury.
Set the dial to an Ohms range, short the probes, and use the red knob on the left to bring the pointer to "0" on the top green scale. 2. Measuring Voltage (AC/DC) Micronta Multimeter 22 212 User Manual
If your 22-212 reads inaccurately on all DC ranges, it may need recalibration. The original manual lists two internal trim pots (accessible via holes in the rear case or by removing the battery cover). The original user manual for the 22-212 includes
The device features a large, easy-to-read LCD display and a durable design with a protective holster. The Micronta Multimeter 22 212 is also equipped with a variety of useful features, such as auto-ranging, data hold, and a low battery indicator. The device features a large, easy-to-read LCD display
Leave a comment (or check the original schematic inside the battery compartment—RadioShack often printed the schematic there for quick repairs).
No resistance readings, and zeroing does nothing.