NOYAFA NF-838 Instruction Manual page 10

Test Result 4: When there is open circuit of cable
The emitter produces a long "tick" sound and LCD displays the picture
below in the meanwhile:
The result indicates that "3" "6" line of RJ45 cable is open.
Test Result 5: When the cable is crossed /disorder
The emitter produces two short "tick, tick" and LCD displays the
picture below in the meanwhile:
The result indicates that "3" "6" line of RJ45 cable is cross.
Test Result 6:
When the cable is cross/disorder, as well as open circuit.
The emitter produces two short "tick, tick" sound and LCD screen
displays picture below in the meanwhile:
The picture indicates that "3" "6" line of RJ 45 cable is cross and "2"
"7" lines are in open circuit.
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Your excellent helper in cable test!