STABILA REC 300 Digital rotating laser receiver with bracket. Easily to read digital display show precise distance from grade in fractions or decimal display. - STABILA Messgeräte Gustav Ullrich GmbH (EN-US)
How to build an optical/light barrier with the Arduino, the Keyes laser module (KY-008) and a laser receiver/detector module - Michael Schoeffler
LASER Receiver Module | Makers Electronics
Spectra Precision HL700 Laserometer Laser Receiver with Rod Bracket - Contractors-Tools.com
La708 Laser Receiver and La998 Control Box (LA708/LA998) - China 360 Degree Receiver, Control Box | Made-in-China.com
Amazon.com : Geekstory 5V Laser Receiver Sensor Detection Module Non-Modulator Tube for Arduino Geekstory(Pack of 5) : Electronics