To them, all the answers are in the price movement. Momentum traders are essentially day traders who treat the stock market as one big casino. They are a sadistic breed that achieves a 'high' from extreme activities - like people who get a thrill out of bungee jumping and walking on a tight rope across the KL Twin Towers. They are not interested in what business the company is in. Their only interest is in the price movement of the stocks they're watching.
Volatility is the name of the game.
It lets you see all the bid and offer prices for each stock, hence a day trader can tell at a glance not only what the market is doing, but what it's about to do. But for all these tools, very few momentum traders actually make money from this sort of trading. Highly unpredictable and detrimental for your health and peace of mind. The faint-hearted should avoid this if possible. Speculators Speculators are particularly fond of stocks which are very volatile and have the highest volume traded on an average day.