If you are looking for a Thermal Probe for the Victor Chargers here is one that I use. You can purchase it from Extech Instruments  it will do both Centigrade ( which the Victor Charger uses) and Fahrenheit measurements.
This unit plugs into the meter jacks and you option your Victor Charger for the thermal option in the charge profile menu. Make sure that you set the selector switch on the Thermal Probe to Centigrade, as the Victor Charger uses only Centigrade measurements