  We present the measurements of scatter broadening time-scales ($\tau_{sc}$)
for 124 pulsars at 327 MHz, using the upgraded Ooty Radio Telescope (ORT).
These pulsars lie in the dispersion measure range of 37 $-$ 503 pc cm$^{-3}$
and declination ($\delta$) range of $-$57$^{\circ} < \delta< 60^{\circ}$. New
$\tau_{sc}$ estimates for 58 pulsars are presented, increasing the sample of
all such measurements by about 40% at 327 MHz. Using all available $\tau_{sc}$
measurements in the literature, we investigate the dependence of $\tau_{sc}$ on
dispersion measure. Our measurements, together with previously reported values
for $\tau_{sc}$, affirm that the ionized interstellar medium upto 3 kpc is
consistent with Kolmogorov spectrum, while it deviates significantly beyond
this distance.
