Velleman VM107 Mode D'emploi page 6

Operation
Operation
When all connections are made, the four LED displays will light up and the module type will appear "107" after which
following messages appear :
If an irregularity is found during the self-test, an error code will appear, when GOOD appears then the unit is ready for use.
6
Eq. Out
r x. x x Version number
T E S T Self-test is working
G O O D Internal parts are working correctly
Equal output indication
Push button for preset value
'UP' button
'DOWN' button
'Reset' button
Counter display