udevadm monitor --property
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[2807.802259] add      /devices/pci0000:00/0000:00:10.0/usb3/3-1/3-1.1 (usb)
ACTION=add
BUSNUM=003
DEVNAME=/dev/bus/usb/003/006
DEVNUM=006
DEVPATH=/devices/pci0000:00/0000:00:10.0/usb3/3-1/3-1.1
DEVTYPE=usb_device
MAJOR=189
MINOR=261
PRODUCT=3f0/a01/101
SEQNUM=2280
SUBSYSTEM=usb
TYPE=255/255/255

KERNEL[2807.804569] add      /devices/pci0000:00/0000:00:10.0/usb3/3-1/3-1.1/3-1.1:1.0 (usb)
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:10.0/usb3/3-1/3-1.1/3-1.1:1.0
DEVTYPE=usb_interface
INTERFACE=255/255/255
MODALIAS=usb:v03F0p0A01d0101dcFFdscFFdpFFicFFiscFFipFFin00
PRODUCT=3f0/a01/101
SEQNUM=2281
SUBSYSTEM=usb
TYPE=255/255/255

UDEV  [2807.849968] add      /devices/pci0000:00/0000:00:10.0/usb3/3-1/3-1.1 (usb)
ACTION=add
BUSNUM=003
DEVNAME=/dev/bus/usb/003/006
DEVNUM=006
DEVPATH=/devices/pci0000:00/0000:00:10.0/usb3/3-1/3-1.1
DEVTYPE=usb_device
ID_BUS=usb
ID_FOR_SEAT=usb-pci-0000_00_10_0-usb-0_1_1
ID_HPLIP=1
ID_MODEL=hp_scanjet_scanner
ID_MODEL_ENC=hp\x20scanjet\x20scanner
ID_MODEL_FROM_DATABASE=ScanJet 2400c
ID_MODEL_ID=0a01
ID_PATH=pci-0000:00:10.0-usb-0:1.1
ID_PATH_TAG=pci-0000_00_10_0-usb-0_1_1
ID_REVISION=0101
ID_SERIAL=Hewlett-Packard_hp_scanjet_scanner_CN619SR0G2
ID_SERIAL_SHORT=CN619SR0G2
ID_USB_INTERFACES=:ffffff:
ID_VENDOR=Hewlett-Packard
ID_VENDOR_ENC=Hewlett-Packard
ID_VENDOR_FROM_DATABASE=Hewlett-Packard
ID_VENDOR_ID=03f0
MAJOR=189
MINOR=261
PRODUCT=3f0/a01/101
SEQNUM=2280
SUBSYSTEM=usb
TAGS=:seat:uaccess:
TYPE=255/255/255
USEC_INITIALIZED=7802538
hp_test=yes
libsane_matched=yes
sane_hpaio=yes

UDEV  [2807.857522] add      /devices/pci0000:00/0000:00:10.0/usb3/3-1/3-1.1/3-1.1:1.0 (usb)
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:10.0/usb3/3-1/3-1.1/3-1.1:1.0
DEVTYPE=usb_interface
ID_MODEL_FROM_DATABASE=ScanJet 2400c
ID_USB_CLASS_FROM_DATABASE=Vendor Specific Class
ID_USB_PROTOCOL_FROM_DATABASE=Vendor Specific Protocol
ID_USB_SUBCLASS_FROM_DATABASE=Vendor Specific Subclass
ID_VENDOR_FROM_DATABASE=Hewlett-Packard
INTERFACE=255/255/255
MODALIAS=usb:v03F0p0A01d0101dcFFdscFFdpFFicFFiscFFipFFin00
PRODUCT=3f0/a01/101
SEQNUM=2281
SUBSYSTEM=usb
TYPE=255/255/255
USEC_INITIALIZED=4744