Measuring Spring Caliper Tools, The Spring Caliper we offer provides precise measurements and is widely used by engineers and carpenters to take precise measurements. The caliper is made of stainless steel and provides accurate measurements. By making use of the adjusting nut of the tool its arms can be tightened when taking measurements. The entire instrument is made out of stainless steel and is rust proof which ensures that it has long service life. Offered at marketing leading prices, the tool offers unmatched value for money to buyers.