What things are said about Scrooge that lets you know he is a miser?

Here is a quote from Dickens:

...a tight-fisted hand at the grindstone, Scrooge! A squeezing, wrenching, gasping, clutching, covetous, old sinner! Hard and sharp as flint, from which no steel had ever struck out generous fire; secret and self-contained, and solitary as an oyster. The cold within him froze his old features, ripped his pointed nose, shriveled his cheek, stiffened his gait, made his eyes red, his thin lips blue and spoke out shrewdly in his grating voice. A frosty rime was on his head, and on he eyebrows, and his wiry chin. He carried his own low temperature about with him; he iced his office in the dogdays; and didn't thaw it one degree at Christmas.