Compression testers for engines. One is made by Harrison cracked glass. Harvey Hanson cracked glass. One also by Hastings. These are older they were in my dad’s collection. To say if they work or not i could not tell you. Could probably be used for parts. Please look at the pictures and thank you for looking. I do combine shipping. On combined shipping refund will be given when more than one item is purchased. I do off of a mobile device so I cannot do invoices. Concerns please look at my feedback and if time allows please check out my store. Thank you