Indicator: Market heat/volatility/speed

Hi,
I'm testing different systems for different market conditions in 1M TF. In certain hous I see that candles are just 1 pip high, and in certain others they are 10 pips or more.
I'm trying to stablish this as a way of selecting a strategy (one for a slow market, one for a fast one), with different SL and TP depending on the conditions.
I thought about creating an indicator which gives me the average of the last n candles (in Low/High and Open/Close).

However, if anyone already uses an indicator which gives the current "speed" of the market that would be better because it would be an already tested one.
I've tested ATR but if you read above that's not exactly what I'm looking for.
Thanks in advance.

Is this it?

Example:

Market moves 10 pips up in 1 hour, so, 10 pips/hour.

Market moves up 100 pips in 1 hour, 100 pips/hour.

Is that what you wanted?

I want the indicator for 1M charts, but depending on the market I'd use one system or another, with different SL and TP.

For example, douring London session, TP would be 15 pips, when all markets are closed, TP would be 3 pips.
I'd use the hours for each market (NY, London, Sydney, Tokyo), however the market doesn't respond the same even when those markets are open.
For example, volatility one twesday with NY and L open at 1pm, won't be the same as the next twesday, same market pair, same your.