Water-Sealing a Circuit for Submersion: LM35 Temp. Sensor Tips

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Proton Soup said:
GND should be connected to the node where the batteries come together, plus to minus.

and they're not likely to discharge at the same rate, fwiw.

Good grief, your right Proton. I snafued again.
 
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OK guys, so assuming I attach the GND from the sensor to the node connecting the two batteries, where should I attach the GND from the multimeter? To the same node?

And thanks a lot for the advice guys, you've been very helpful!
 
yes, GND is the reference point, 0V
 
Thanks proton, I'm going to wait for the parts to arrive then reassemble everything.

I'll let you guys know how it turns out.