They display true RMS values regardless of the waveform shape of the signal. The meters feature an interchangeable scale and have an accuracy class of 1.5.

Meters are available with different front frames:

FQ 0507 – 45 x 45 mm
FQ 0407 – 48 x 48 mm
FQ 0307 – 72 x 72 mm
FQ 0207 – 96 x 96 mm
FQ 0107 – 144 x 144 mm

FQ 3307 – 72 x 72 mm (6-stage selector switch is built in the meter for measurement of all voltages)
FQ 3207 – 96 x 96 mm (6-stage selector switch is built in the meter for measurement of all voltages)
FQ 3107 – 144 x 144 mm (6-stage selector switch is built in the meter for measurement of all voltages)

FN 0103 – 86 x 72 mm
FN 0201 – 115 x 96 mm

All their dials have 90 degrees.
Ship versions of FQ 0407, FQ 0307, FQ 0207, FQ 0107 are also available.
Special meters can also be made, according to your requirements.