20 Most Recent Gardner Bender GVD-505A Non-Contact Voltage Tester with Pocket Clip Questions & Answers

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That tester uses 2 (two) LR44 (1.5 volt) batteries.
http://www.aikencolon.com/assets/images/pdfs/gardnerbender/Testers.pdf
See p.143.

Two LR44 button batteries.

It is NOT the tip that slodes off but the pocket clip. Just slide the clip up, away from the tip, and you will see the batteries.

The 12P is just a plain old style meter. This is the GMT-312P and should be close enough https://www.gardnerbender.com/-/media/inriver/GMT-312_USE.pdf?modified=20200714162511 or you can contact direct at bottom of the page. https://www.gardnerbender.com/en/p/GMT-312/5-Function-Analog-Multimeter ..

AA means double A , AAA means triple A, 9 volt has a double lead with two wires on it. which do you have?

you need to connect your unit in DC Amps mode in series with charger when in use BUT be careful that anything over 10A will blow the fuse

http://www.gardnerbender.com/pdf/instructionmanuals/probestesters/gdt-3190.pdf

what about it?

The 20K setting is close to what you're looking for. The 200 scale is best to read 0 to 200 ohms, the 2K setting would be to read 200 to 2K, the 20K is to read 2K to 20K, the 200k range is for 20K to 200K and finally, the 2000K is to read 200K to 2000K or (2M) ohm resistance.Basically, start on the high range, and work your way down until there is only one (or none) digit after the decimal point in the display for the best accuracy. A 6,500 ohm value may display as .006 reading on the 2000K range, and as you can see, doesn't give a true reading of the actual value. I hope this helps!