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This Magnetic Reference Laboratory calibration tape is used for standardizing azimuth, equalization and determining the "0" level or sensitivity of your 1/2" deck. This tape is for the 15 IPS IEC equalization standard at 355 nW/m level which is that of the +6 dBm operating level tapes (see section header for a list.) Can also be used to calibrate +9 dBm operating level tapes by setting your repro to show -3 VU rather than 0. Recorded at 15 IPS. Eight minutes long.