Will this work on DC solenoids?

Probably not. Download the Danfoss ref tools app, it has a magnetic tool in the app that you can use for both motors and solenoid valves.

Is this for a pack of 50 Company's give these away all the time for free?

No, it’s not for a pack of 50, read the description

what kind of motor does this work on , I have tried it one a 1/2 hp all the way up to 1000hp and it does not work they are all ac drive motors

These work on the 1/25th+ holiday pumps I install on hydronic heating systems. Hold the disc up against the end of the motor and it will spin the same direction as the electrical flow...........it does not tell you that the impeller is rotating it only tells you that there is power to the motor and its trying to turn the impeller, and which direction it is trying to turn it.

Brand	Geonordic
Power Source	Battery Powered
Color	White,Red
Item Weight	0.02 Pounds
Item dimensions L x W x H	3.1 x 2.1 x 0.4 inches
Measurement Type	AC Field Detector
UPC	701722949713
Manufacturer	Geonordic
Global Trade Identification Number	00701722949713
Part Number	7-201
Item Weight	0.32 ounces
Product Dimensions	3.1 x 2.1 x 0.4 inches
Item model number	7-201
Is Discontinued By Manufacturer	No
Size	Compact
Pattern	Two-color disc pattern
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

Rotation Tester and AC Detector for Circulating Pumps etc

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