Yes, it's an odd one, thanks for the part number!. I had to rob a connector from a different wall wart to splice onto a 9V unit. Before connecting to the other wall wart I used the connector to power the meter from my bench supply, but it's very flaky and doesn't quite have the depth needed. On the bright side I was able to measure the power draw: it's 10.4 mA at 9.00 Vdc and anything other than 100 kHz, in which case the draw is 12.8 mA. With the meter turned off the parasitic draw is a steady 92 uA.
Do you know the input power tolerance or the actual measured voltage output of the DER-EE branded wall wart? The actual output of my 3 cheap 9 Vdc wall-warts are all above 11.5 Vdc at the measured current draw of the meter, so I don't want to plug one in unless I believe it won't blow up the meter.
Until then, I just installed a small toggle switch at the back next to the battery compartment to stop the parasitic battery drain.