CCE Prague, spol. s r.o. has two digital levelling instruments Leica DNA 03 with automatic reading on levelling rods, which eliminates eventual errors in taking readings. Root mean square error in measuring with a standard rod is 1.0 mm or 0.3 mm per 1 km and 0,3 mm when measured with an invar rod. Lengths of measuring distances are in the range 1.8 – 110 m.
The instruments can be used with different types of levelling rods according to required final accuracy (metallic rods, invar rods, code rods).