A wearable sensing device, comprising a sensor carrier having a sensor at a first side for touching the wearers skin, an elastic band having two ends, a fastener attached to each end of the band, two elongated fastening slots extending from an exposed side opposite to the first side of the sensor carrier, wherein the elongated fastening slots are located at opposite locations near an edge of the sensor carrier. The elongated fastening slots are arranged for receiving the fasteners. The first side having the sensor is the side of the sensor device to be pressed against the subject’s skin. The opposite side is visible side of the sensor device and is exposed to the environment. The first side may contact the skin of a limb, e.g. an arm of the subject wearing the device, allowing it to perform its measurements.
