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PSV 黑商店 pkgj 无法刷新列表 显示HttpError 的解决办法 原因：pkgj 服务器挂了（和谐了），需要外挂缓存文件，必须安装插件去加载缓存文件。 下面为解决文件和方法 PSV工具箱+黑商店+本地缓存文件+config文件+安装图文说明

Pulse oximeters noninvasively measure or continuously monitor oxygen saturation in arterial blood to ensure that there is sufficient oxygenation. Typical applications include people with respiratory problems who are under anesthesia, neonates, and critically ill patients. In a pulse oximetry system, a clip with optical electronics is usually attached to a finger, toe, or ear so that light can be transmitted through the skin from one side of the clip and received on the other side with a photodiode. Good arterial blood flow is required to measure oxygen saturation. Most applications use transmissive optical techniques, but there are some applications that use reflective techniques.