Series LTS | Tilt Switch Probe senses either the presence or absence of material. Airtight, dust tight, and waterproof. Applications include large hoppers, silos, crushers, trippers, stackers, and conveyors. | Dwyer Instruments
How to Use Tilt Sensors on the Arduino - Circuit Basics
Inclination Sensor In Tipping Application In Trucks And Tippers: Get All Inside Here!
Mercury tilt switches
RT Tilt Switch Slope Alert - Rieker Inc.
Mercury switch - Wikipedia
How Do Tilt Sensors Work?
SINVT-TTL Voltage-Output-Type Tilt Switch】High-Stability Dual-axis Analog (0-5V, 0.05° Accuracy) Secury Inclinometer, Anti-Vibration Tilt Angle Sensor (IP67 Approved) for Building/Bridge Monitoring : Amazon.co.uk: Business, Industry & Science