Laser Rangefinders

• https://www.tme.eu/en/news/library-articles/page/21956/laser-rangefinders-how-do-they-work-which-one-should-you-choose/
• https://www.hackster.io/iliasam/making-a-cheap-laser-rangefinder-for-arduino-4dd849
• https://sudonull.com/post/24300-Homemade-Scanning-Laser-Rangefinder

Laser Thermometers (pyrometers)

• https://sciencing.com/laser-thermometers-work-4962575.html

Record Players

• https://electronics.howstuffworks.com/record-player.htm

Digital Calipers

• https://www.wonkeedonkeetools.co.uk/calipers/how-does-a-digital-caliper-work

Ultrasonic Distance Sensors

• https://www.arrow.com/en/research-and-events/articles/ultrasonic-sensors-how-they-work-and-how-to-use-them-with-arduino
• https://www.maxbotix.com/articles/how-ultrasonic-sensors-work.htm
• https://www.youtube.com/watch?v=2ojWO1QNprw
• https://www.youtube.com/watch?v=1jGvzNrtF24