The popularization of microcontrollers like Arduino bring new possibilities of experiments for physics laboratories. For instance, load cell sensors have been used in experiments on impulse and buoyancy. Here we propose an experimental apparatus using Arduino connected to a load cell to measure surface tension by the du Noüy method (or ring method). The load cell gives the instantaneous and the maximum force value achieved during the experiment. This apparatus is presented as a simple and low-cost opSensorstion for physics laboratories.