Mobile app for UTi720M/UTi721M can only be installed on smartphone with Android M and higher versions.
You can download & install mobile app for UTi720M/UTi721M from this link directly: https://play.google.com/store/apps/details?id=com.unitrend.thermal_mobile_721
UTi720M and UTi721M are different in color, temperature measurement range, and temperature measurement mode, details are shown as below:
Color: UTi720 adopts silver appearance design, for UTi721M is black.
Temperature measurement range: The temperature range supports to be measured by UTi720M is -20℃~200℃, for UTi721M is -20℃~550℃.
Temperature measurement mode: Only Industry mode is available for UTi720M. For UTi721M, both Industry & Human body modes are supported.