Tom cat is dead right. here's the manufacturers response to my question about it:
Hi Gavin
It is an old diaphragm type valve spring tester with a one piece anvil, part number 360000
We have had a look for some information on it, but unfortunately we can't find any.
Hope this helps.
Regards,
Anthony Pittella | Account Executive Precision Tools
Ph: +613 9317 6888 Fax: +613 9318 6091
Mob: +61 409 947 342
108 Mitchell Street, Maidstone, VIC 3012
Email: anthonypittella@warrenandbrown.com.au
warrenandbrown.com.au