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Ultrasonic Proximity Sensor: 30mm diameter x 88.8mm body, 250-3500mm range (PN# UT1B-GW-0A) | AutomationDirect
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HC-SR04 Ultrasonic Sonar Distance Sensor + 2 x 10K resistors : ID 3942 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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HC-SR04 Ultrasonic Sonar Distance Sensor + 2 x 10K resistors : ID 3942 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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