What indicators can I use to measure trend strength?

Hi all, I am trying to identify an indicator that can help me tell when it is probable that the market might break a support or resistance level. I do not know if there is an indicator based on volume or volatility that might give a me heads up on a strong move. I have attached an image of the 4h EURJPY which today just broke through a resistance level as indicated.

heres a volatility indicator:

thanks blacksun1, will have to do some research on this as I have not heard of it.

i`m sure you will be happy with ADX if you know how to use it )))

movin average

ADX is the best ..
if the indicator is going up and more than 20 .. this mean there are a clear trend to be seen !!
if it's more than 40 .. this means that the trend is too long to have the ability to change into side way or down trend ( in case of up trend )
i myself think that in this chart .. the ADX may be less than 15 !!