Had to prat about looking for a chest freezer thermostat.
Question I have is came across this from Mr Tonoto:

Thermostat guide:

Fridge Thermostat: Ranco VF3,VL3: Universal
Ranco:
UNIVERSAL
Freezer/Ice cream cabinet: 'No signal'
Cold out -34c, Warm out -16.5c, Warm in -12c, capillary length 2000mm:

Fridge Thermostat: Ranco VS5,VL5: Universal
Ranco: Compares to Atea W6, Danfoss Kit 6 and Whirlpool WPLW6
UNIVERSAL
Freezers with signal:

Cold out -34c, Warm out -16.5c, Warm in -12c. Signal operation cuts in 5c above cut in. Capillary length 2000mm

What is meant by signal or no signal?

Situation is electronic version broken on a Walls Ice Cream chest freezer so just want to use a mechanical one. Could be a VF3 or a VS5, only difference is the signal bit.
Thanks,
Andy.