A simple apparatus for measuring and comparing the relative "hardness" of utility poles is described. This "slide-hammer" gaff penetration apparatus was designed as a field testing unit to measure the depth of gaff penetration into test poles after application of a uniform and reproducible force to the gaff. The apparatus is simple to use in both the laboratory and field. Data is provided for results from post sections treated with CCA with and without additives designed to improving pole climbability characteristics. Results from these preliminary studies suggest that this apparatus can detect differences similar to that observed with a universal testing machine and a pilodyn, but with usually lower variability between replicate measurements than the other techniques.

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