Hello, it would be appropriate to test whether the meter measures inductance. As many of us somehow deal with the measurement of C / ESR, my intuition tells me that a group of colleagues struggle with the measurement of L, in any case I would be most interested in this function of the meter. Another thing is the matter of measuring electrolytes without desoldering, it is interesting if the measurement error is so small that it can be determined whether C is good / damaged.
There has been this device for some time and I am very happy with it. I desoldered the socket for the 14500 battery and soldered the 18650 cell directly to the board. The length fits perfectly. It does not protrude beyond the outline of the pcb. I also designed a simple casing for 3d printing and inserted a quick coupler. I recommend it, quite a useful device.