All units on construction sites operate under tough conditions – they withstand vibrations, moisture, dust and extreme temperatures. Should there be any problem with your “TERRATEST 3000 GPS” after many years of use, the TERRATEST customer service team will take care of it. We will make sure that the repair is quick and the value of your device maintained. That’s our promise! According to international standard ASTM E2835-11 Light Weight Deflectometers have to be calibrated once per year at an accredited calibration institute.TERRATEST calibrates Light Weight Deflectometers with the calibration system “CS 01”, developed and constructed by TERRATEST and accredited by the German Federal Road Research Institute (Bundesanstalt für Straßenwesen). It goes without saying that every device gets a free, complete function check-up and is cleaned thoroughly before delivery.