This paper presents an objective review of two non-destructive methods developed for the rapid and cost-effective testing of compressive strength on rock cores. Rebound impact test and scratch test methods are compared. Respective advantages and drawbacks are listed in terms of the following aspects: (i) sample preparation, (ii) destructivity, (iii) repeatability, (iv) resolution, (v) natural bias, (vi) sensitivity to sample size and, (vii) lithology dependence of the correlation between test results and rock strength. Discussions of these points are illustrated with examples from a large data base consisting of sets of Leeb hardness values and scratch strength collected on core samples from different formations including sandstones, carbonates and shales from various regions around the globe.

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