DRE Vet Masimo Radical 57 Pulse OximeterDescription DRE Vet Masimo Radical 57 Pulse Oximeter The Masimo Rad 57 is the most adaptable handheld oximeter in the world, featuring a durable, lightweight design perfect for use in the field or in medical facilities. The Rad 57 does not require patient cooperation or awareness, nor does it require user calibration. This is a fantastic alternative to the current handheld pulse oximeters. Spot check and continuous monitoring measurements of SpHb,