It is a compression tester made by Sears and is manufactured in the United States.
New Vintage SEARS Flexible Drive Compression Tester Complete No. 28-2171 USA H1
Vintage Sears Flexible Drive Engine Compression Tester Kit 28-2171
Vintage SEARS Flexible Drive Compression Tester Complete No. 282171 + Peerless
Vintage SEARS Flexible Drive Compression Tester Complete No. 282171 Made in USA
Vintage SEARS Flexible Drive Engine Compression Tester Kit 161.217103 Made USA