Helios Preisser DIGI-MET® Pocket Calipers - Helios Preisser 1320 417, These high-quality stainless steel precision DIGI-MET® Pocket Calipers from Helios Preisser have a 7.5mm LCD display and are accurate according to DIN 862. These calipers have a QuickLock function which ensures they cannot accidentally be reset to zero. Helios Preisser 1220 417 DIGI-MET® Pocket Calipers 150mm Without Data