Is this lamp bright enough to read by?

It is a small accent lamp with a linen shade, so expect soft ambient light rather than a focused reading beam. It suits mood lighting and bedside use; for reading, pair it with a dedicated task lamp.

The body is optical crystal, the hardware is natural brass, and the shade is scalloped linen. The crystal is clear and sculptural, so the lamp is meant to be seen as well as used.

Can I use it as a pair on side tables?

Yes. It is designed to work in pairs flanking a sofa, and the small size keeps two from crowding a side table. Two also balance a room better than one on its own.

Does it have a dimmer or adjustable height?

Nothing in the product details mentions dimming or height adjustment. Treat it as a fixed small lamp and use a dimmable bulb with a compatible switch if you want softer evenings.

Will the crystal and brass tarnish or need care?

Brass darkens naturally over time, which many owners like; polish it if you prefer a bright finish. Wipe the crystal with a soft cloth, since clear surfaces show dust and fingerprints.