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Here we consider the results of direct measurements of muons in extensive airshowers with zenith angles $\theta \le 45^{\circ}$ and energy above $10^{17}$eV, obtained at the Pierre Auger Observatory and Yakutsk array. In bothexperiments muons were registered with underground scintillation detectors with$\approx 1.0 \times \sec\theta$ GeV energy threshold. Measured density valueswere compared to theoretical predictions calculated within the framework of theQGSJet-II.04 hadron interaction model. They differ by factor $1.53 \pm0.13$(stat). We demonstrate that this difference is due to overestimation ofmuon densities by 1.22 times and underestimation of primary energy by 1.25times in the Auger experiment.

A Direct Comparison of Muon Measurements at the Yakutsk Array and the Pierre Auger Observatory