How many blades are included with the scraper?

One blade is included with this scraper.

Does this fit onto the Ettore REA-C-H extension pole?

These tools are compatible via pressure fit.

Does this fit in the ninja scraper holster or no?

Yes, but it isn't perfect. The handle is a little too big for where it clips in.

Can I attach this to my xzero pole

Yes, with the Unger tip.

Can it attach to my unger pole?

Unger Locking Cone Pole Tips are compatible with this Unger Scraper.

Is this ceramic coated? Would it be okay to use on solar panels?

It is NOT ceramic coated and we do not recommend it for use on solar panels as scrapers may scratch or damage solar cells. The best option for cleaning solar panels is a non-abrasive sponge and soapy water.