I researched which oximeter to buy in some depth and then decided upon this one. The screen is clear (some were fuzzy round the edges) and can be rotated to make viewing easier. You can also see your pulse rate as a bar or a wiggly line, which is fun. I've tested it by taking deep breaths to calm breathing down and increase oxygen levels, and it responds really quickly (about 2 seconds) to these changes. I saw it uses 'Swiss' technology, and this was an endorsement I valued. It is definitely worth spending the money on this device for all its features, sturdy, attractive build and reliability.