This article presents the relevance of the evaluation of technical condition category when inspectingconstructions, built in the second half of the 20th century. One of the tasks, arising at the stage of instrumental technical inspection, is determination of strength characteristics of materials for further testing calculation. Applying to reinforced concrete structures, it is necessary to determine the concrete strength at compression and parameters of reinforcement. In the theoretical part of the study the main issue was thecomparative analysis of the existing control methods of the aboveground reinforced concrete structures. In theempirical part of the study the main concern was finding out the reliability of the test results, received with the use of elastic rebound method by different tools.The results of the study indicated that there is the necessity of application and improvement of non-destructive control equipment.