Hello, welcome!
I use the Freestyle Optium testing strips for the reader to test my blood, yes they're pricey but it was recommended by my dsn to use them and you can use the ketone strips to test your blood ketones. Fantastic meter to test both BG and ketones but it does cost the NHS a fortune at £30 per box for test strips. I think £20 for ketone strips as well. I think I will consider another meter that does both ketones and BG readings.
There is the freestyle lite meter for the test strips you were prescribed, I think your diabetes centre can give you the meter for it.