Abstract The Inexpensive Device for Sea Level measurement (IDSL) has been implemented tsunami monitoring and early warning in the Mediterranean regions. Following events of 2018 Palu Sunda Strait Tsunami, MMAF, JRC-EC, IATsI, BMKG worked together installed eight (8) units IDSL Indonesia starting from January 2019. This paper discusses concept IDSL, installation operation last 18 months its pote...