Pololu
QTRX-HD-04RC Reflectance Sensor Array: 4-Channel, 4mm Pitch, RC Output, Low Current
£2.00£4.99Unit price /UnavailablePololu
QTRX-HD-07RC Reflectance Sensor Array: 7-Channel, 4mm Pitch, RC Output, Low Current
£3.20£7.99Unit price /UnavailableMaxbotix
Mounting Hardware for MaxSonar Outdoor Ultrasonic Sensors
£1.53£3.83Unit price /Unavailable