MB1230 XL-MaxSonar-EZ3
High Performance Ultrasonic Rangefinder
Features of the MB1230, XL-MaxSonar-EZ3, include centimeter resolution, a narrow beam as well as excellent side object rejection, short to long distance detection, range information from 20cm to 765cm, a 10Hz read rate, and various output options: pulse-width, analog voltage, and RS232 serial.
The MB1230 has slightly wider beam width than the MB1240 which makes it a good choice for applications where the MB1240 does not have enough sensitivity.