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
Vintage Sears Flexible Drive Engine Compression Tester Kit 28-2171
Vintage SEARS Flexible Drive Compression Tester Complete No. 282171 + Peerless
Sears Flexible Drive Engine Compression Tester Kit 28-2171 NEW OLD STOCK
Vintage Sears breakerless ignition analyzer 28.21031 w/ low dams scale new
