Freestyle Optium Beta Ketone Test Strips (10). FreeStyle Optium Beta Ketone Test Strips for self-testing your blood ketones.. Compatible with the FreeStyle Libre system, FreeStyle Optium and FreeStyle Optium Neo blood glucose meters.. Individual foil-wrapped strips for minimised contamination and influence from external factors. Small sample size (1.5 μL). 10 second test time. Fill trigger ensures reaction starts only when sufficient sample has been applied. Top or tip fill. Has a 30 second sample reapplication time. Measuring your blood ketones during hyperglycaemia and illness, allows you to take action before ketoacidosis develops.