Digital volt-amp meter with amp sense question

Lately doing a lot of electrical items on the old boat, shows volts and amps.
A few questions.

IF I put 2 hot wires inside the sense ring it show the sum of the amps flowing in both wires?

IF the 2 hots are on different phases does it show the sum of the amps flowing in both wires?

IF the hot and neutral are inside the ring, does it read zero amps unless there is a current leak?

http://www.ebay.com/itm/29074943917...NX:IT&_trksid=p3984.m1439.l2649#ht_803wt_1165

 

The sensing element is a current transformer. So it will take the vector sum of the current(s) passing thru it. If the currents are exactly out of phase i.e. Line and Neutral it will read zero current.

 

IF I put 2 hot wires inside the sense ring it show the sum of the amps flowing in both wires? YES

IF the 2 hots are on different phases does it show the sum of the amps flowing in both wires? NO, there is a 120 degree phase shift. it shows approx 0.7 times the actual current.

IF the hot and neutral are inside the ring, does it read zero amps unless there is a current leak? YES, but the leakage current may not show or the value may not be accuarate because it is too small.