why is this sold as a 50 pack?

don't know. i just received the one device (which works ok).

Will this work on the PowerProbe 3??

Yes it will. I have a PP3 and it works perfectly.

Has anyone bought one that didn't work? Mine doesn't.

Ensure you have the Power Probe Adapter fully plugged into the PP and ensure the GROUND wire from the PP is firmly connected to the PPAdapter's METAL TAB on the side of the adapter. Then apply your +12VDC by pressing the PP [+] button. You should see +5VDC at the tip. I sold about 150 of these and never had one come back. Good Luck!

ASIN	B076QB4BQL
Battery Cell Type	Lead Acid
Battery cell composition	Lead Acid
Best Sellers Rank	#105,241 in Automotive ( See Top 100 in Automotive ) #72 in Automotive Cables & Adaptors
Brand	Power Probe
Color	red
Colour	red
Connector Type	banana_plug
Customer Reviews	4.7 out of 5 stars 1,282 Reviews
Enclosure Material	Plastic
Form Factor	Compact
Frequency Range	50/60 Hz (± 3 Hz)
Global Trade Identification Number	00816724020411
Input Voltage	5 Volts
Item Dimensions	16 x 2 x 10 centimeters
Item Type Name	Adaptor
Item Weight	0.07 Pounds
Item weight	0.07 Pounds
Manufacturer	POWER PROBE
Material	Plastic
Mfr Part Number	PPT5VA
Model Number	PPT5VA
Number of Outlets	1
Output Voltage	5 Volts (DC)
Power Plug Type	No Plug
UPC	816724020411
Upper Temperature Rating	1 Kelvin
Voltage	1 Volts

Power probe PPT5VA Adaptor

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