With the lower left toggle switch set to the right-side, the meter reads AC (pseudo-RMS). When measuring AC, the meter is not sensitive to DC or to the offset settings. Accuracy is +/-3% in the interval 45Hz - 2000Hz. The -3 dB frequency interval is 16Hz -20KHz, although frequencies above 2000Hz may induce falsely high readings because of inductive pickup. This accuracy applies to the19,999 and 1999.9 ranges (The 199.99 range has a low-pass filler that nullifies AC).

Remember to return the toggle switch to the left position for standard (DC) measurements. Only areas close to a transformer, a motor, a fluorescent ballast, or a wire carrying AC current will produce a significant AC reading. Other areas will produce near-zero AC readings. A wire carrying 10 amps AC (RMS) will yield a reading of 1.8 gauss AC, at a distance of 1 cm from the wire. Magnetic field is proportional to current divided by distance from the wire, for a single long wire.