Go to ontool.com and search for "strut compressor." They have one made by S&G Tool Aid for less then $34 (I have a diesel compression gauge made by S&G and it is a good tool), then two other compressors for about $90 (one by OTC a quality tool maker and another manuf. I am not familiar with), and one for about $185 - after that $400-$600+. On Tool has a toll-free number so you can discuss the tools to get a feel for the one that will fit your needs best. Free shipping for orders over $50.
America: Land of the Free!
1977 300D: 300,000+ miles
American Honda: Factory Trained Technician & Honor Grad.
Technical Advisor to Am. Honda;
Supervisor of Maintenance largest tree care co. in US for offices in Tex.