(But I suppose someone else might call the whole circuit a "net". The whole circuit may called the "netlist". They are all the same, although "wire" can be misleading because SPICE doesn't really have wires, in the sense that they all have zero length. People often use "net" to mean a connection or wire. Move the mouse pointer so that it rests on the first net. "What does it mean to "place the mouse over one net"?" We do have confusing / conflicting / imprecise terms. TRAN analysis, therefore you want to see the transient voltage between two points. This gets a little tricky because "AC" in SPICE usually means you are talking about an. This allows you to differentially plot voltages" You will see the red voltage probe at the first node and a black probe on the second. You can click on one node and drag the mouse to another node. "It is also possible to point at voltage differences with the mouse. I guess you forgot to read the Help page about Waveform Viewer > Data Trace Selection. Place the mouse over one net, click and hold, drag to the second net, and release. In LTspice, graphically plotting a voltage between two points is easily done. V(J1,J3) is standard SPICE syntax for a differential voltage. See the paragraph below the first figure on this Help page: Waveform Viewer > Waveform Arithmetic. Referring to a voltage between two points in SPICE is done either of two ways, which are identical to one another: "How to measure or plot AC voltage between two points?"
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