kHIDUsage_WD_ScaleScaleClassIMetricCL

objc2_io_kit

Constant kHIDUsage_WD_ScaleScaleClassIMetricCL 

Source 
pub const kHIDUsage_WD_ScaleScaleClassIMetricCL: c_uint = 0x21;
Available on crate feature hid only.
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Apple’s documentation