Apparatus to measure resistance/hardness of unstable materials, e.g. ash crusts, has a feeler with pointed needles and a sensor linked to an evaluation unit and display

摘要

The apparatus to measure the strength of inhomogeneous materials (M) has a feeler (11) with two spaced and pointed (14) needles (13) at a carrier (15). It has a sensor (12) to determine the material resistance, together with an evaluation unit (20) and a display (21). A path movement meter (30) detects the needle penetration depth (t).