These are the
most popular short two speed calibration tapes. The idea behind a two
speed tape is that you get what you need to calibrate the operating
level and azimuth and a few other frequencies. but not the
plethora of frequencies in a multifrequency tape listed in a separate
section. These tapes save you money.
For initial and long term stability, excellent slitting, and response integrity, all 1/4" MRL tapes are recorded on RMGI SM911 tape stock or ATR Master Tape (see options in each tape description.)