This listing is for me to compression test your rotary engine. The tester itself is not for sale. Please get in contact with your location to arrange a test. Don't not press buy it now without discussing your requirements first. Providing accurate and repeatable compression readings on all rotary engines from 10A through to the latest Renesis 13B. This is ideal if purchasing a new rotary, testing a rotary you currently own or diagnosing issues. Currently, in the South Dorset Area nr Wareham. I am also in the Wiltshire and Chippenham area from time to time.