Zacurate is an international brand of best selling pulse oximeters. It is now one of the most popular brands of digital pulse oximeters on Amazon, Walmart and other global markets. The user manuals of each pulse oximeter manufactured by Zacurate are found within their individual webpages. Simply click on your desired zacurate pulse oximeter, scroll down to locate the user manual tab and click the link within the tab page. If the link does not work properly or does not open on your desktop or mobile device, please contact us and we will provide you with a copy.