Over 35 cm long metal piece with multiple adjustable screw. Made by Helios in Germany. Also has Finnish army tower stamp. Is this some kind of tool? : r/whatisthisthing
HELIOS PREISSER 0396290 Alpha Angle 795 x 430 mm : Amazon.co.uk: DIY & Tools
HELIOS-PREISSER 0611510 Fühlerlehrenband 5 m x 13 mm i.Plastikdose 0,10 mm : Amazon.co.uk: DIY & Tools