Well, I checked, no calibration in software version 1.02
Also, if you think calibration would be useable for sense-compensation, you might be mistaken.
as you probably know, the voltage drop will vary with current as well as temperature. You'd have to have a separate calibration value for each cable and each current that you might use.
You do not need a exterbal sense, if you just want to stress test some power supplies, and need to dump the energy somewhere.
A simple multi-meter could be your voltage sense.
However, if you want to test some batteries, or simply want to have the convenience of not having to hook up an extra multimeter, yeah, it is a bit silly they still sell this without sense wires.