Couldn't wait for part III and purchased a few weeks ago.
FYI
Positive changes:
1. Capacitor is 400V.
2. Version is upped.
3. List length increased to 30, example auto solar panel test pic
Negative changes:
1. Load Setup screen errors.
The descriptions on the right side (3rd column) are messed up. CURR MULT is a repeat of bottom left and should be AUTO OFF. AUTO OFF should/be MAX CURR, MAX CURR s/b MAX VOLT, ect. Sent email to Beich, no reply.
2. In System Setup/COMM MODE pressing enter key will show two blank menu selections. You can still select them though RS232C or USB-CDC. RS232C works, haven't tried USB.
Same issues:
. Acquisition Frequency in System Setup still requires down arrow to access.
. sense connector fit same
. Same bodge cap on fan connector although better done
. Same interference on cap and heatsink
. Four largest electrolytic caps are Chongx
. Display is the same but it looks great and I don't consider this a Beich quality issue.
. Fan turn-on at 25C is bothersome, at least it's variable speed.
Really like it so far even with the blemishes. Wrote some SCPI to the back rs232 and worked no issues.