kHIDUsage_WD_ScaleScaleClassIIIMetric

objc2_io_kit

Constant kHIDUsage_WD_ScaleScaleClassIIIMetric 

Source 
pub const kHIDUsage_WD_ScaleScaleClassIIIMetric: c_uint = 0x24;
Available on crate feature hid only.
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Apple’s documentation