That connection doesn't allow for a "switch," as it's obviously not bring both "forward" and "reflected" current data from the coupler to the meter housing. So, looks like you're stuck with swapping the coax connections around if you want to know what reflected power or SWR is.
Originally Posted by KB1ZEJ
The MicroMatch couplers I've had have three wires coming from the coupler to the meter box: A forward wire, a reflected wire, and a common (shield). Using a switch on the meter housing, it swaps what drives the meter from "F" to "R."
Although the meter may not be marked for DC microamps, it is. Probably 0-50 or 0-100 uA. Wouldn't be difficult to measure it and see.
What if soy milk is just regular milk introducing itself in Spanish?