Hi,
Time to let another friend... err... meter go: this is a used Gossen 25S that, to my level of verification, works just fine (please see attached pictures).
Please note this particular model specifically has a low input impedance in V mode: 5 MOhm for all ranges, AC and DC, except for 300mVDC (the impedance is 10MOhm for this range).
You can find more details in the meter datasheet on Gossen's web site (Google search is your friend there).
Also, please do not confuse the meter being sold here, when looking at the pictures: it is the meter on the left.
Asking price is £75 plus shipping.