Manikadia Nool is a component used in modern siddha medicine as a diagnostic tool to analyse the state of disease, severity and death signs by measuring distal forearm. Manikadai Nool diagnostic tool comprises an electronic measuring device and a mobile application which integrates the physical values obtained from the measuring device and maps its appropriate siddha medicine diagnosis using various parameters which belong to the traditional practices of siddha diagnosis and treatment process. Manikadai Nool measuring device measures the wrist circumference and 4 finger circumference (distal forearm) measurements. The objective of a Manikadai Nool measuring device is to provide a more accurate, efficient, and convenient way to measure circumference measurement.