The pulsar-wind-powered synchrotron nebulae are used as carolimeters to measure the parameters of the relativistic wind: using the observed luminosity and the two characteristic photon energies of a synchrotron nebula, we derive the Lorentz factor γw and the magnetization parameter σ of the wind and also the nebula field B. The method is applied to the nebulae observed with ASCA, and we obtain γw <<< (4.5-14) × 107(B/10μG)1/2, and σ <<< 10-3 for the middle-aged pulsars. The dominance of the kinetic energy in the wind persists even for the slower pulsars than the Crab, and seems to be a general feature of the pulsar wind
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