On this time of crisis when the healthcare techniques are each overloaded and BloodVitals monitor their facilities at larger risks of spreading contagion then this nifty little system that 'should' not cost an excessive amount of although costs have been hyped ignorantly from the £20 or so that they had been selling fro in direction of £40, apart from those that have simply appeared on Amazon and thus seemingly or of dubious quality. Nevertheless we did our analysis and purchased one that's been on the market for a number of years with loads of feedback so that we can help monitor BloodVitals experience oxygen levels at this present time of world crisis in order to know where we stand. Of course it is good to get some base line readings in order to ensure these oxygen sensors really work as this video illustrates as we try the Zacurate oximeter purchased from Amazon for BloodVitals experience £36 (Zacurate&reg