From the article > Motion sensors in wearable devices are usually sensitive to accelerations in the range of [milli-gs]. Bigger, more expensive accelerometers

From the article > Motion sensors in wearable devices are usually sensitive to accelerations in the range of [milli-gs]. Bigger, more expensive accelerometers ... on the order of [0.1 mill-gs] > More accurate than either of these mobile accelerometers are cold-atom interferometers. These currently have sensitivities of [nano-gs], with future potential for [femto-gs], Kodigala says.