Meridian M20L Green Laser GNSS RTK is an innovative solution that combines advanced laser technology IMU, and 4G integration. It is calibration-free, significantly boosting operational efficiency and laser measuring makes the rodless survey improve efficiency and reduce risk factors. The M20L green laser receiver provides a new way to work in challenging & impossible& dangerous scenarios with high accuracy, including riverine stake-out, bridge pile surveying, elevation surveying, municipal surveying, outdoor & indoor combination surveying, and power station surveying, ect.