IP67 digital calipers The range of IP67 calipers gurantees the highest level of protection against the ingress of dust and liquids. The TLC (Tesa Link Connector) system built into all the TwinCal calipers provides the connection of these instruments to a PC for the easy acquisition of measurement data. The unique display housing, protected by a steel plate surrounded with a rubber seal guarantees durability and offers fine sensitivity during measurement.