The TIME Crack Depth Gauge TC200 measures the depth of cracks in concrete without breaking out the structure, using the principle of acoustic diffraction. Knowing how deep a crack runs tells an engineer whether it is surface crazing or a structural concern that needs repair, which is a key decision in assessing the condition and safety of concrete elements.

The TIME Crack Depth Gauge TC200 is a non-destructive test instrument that also measures the propagation velocity of an ultrasonic wave through concrete. A special bracket holds the two measuring points at a fixed, accurate spacing, and the unit gives a direct digital read-out of the crack depth so there is no manual interpretation. An onboard database stores and manages completed test data for analysis and reporting, with an RS232 interface to a PC. The display is shown entirely in English for clear, easy use.

The testing range is 4 to 500mm. Tolerance is within 5mm for cracks shallower than 50mm, and within 10 percent of the crack depth for cracks deeper than 50mm. It stores up to 25000 test records on a large graphic display, runs on six AA batteries and operates from minus 10 to 40 degrees C. The unit measures 210 x 153 x 90mm and weighs 880g. Used in concrete testing and structural assessment, it is supplied by BAMR, South Africa's authorised distributor.