New AP-5 Multi-function OBD2+GPS+Slope Meter LCD Speedometer Smart Gauge Digital
Tomshine Speed Slope Meter, Digital Inclinometer Level & Angle Gauge, Speedometer, Tilt Gauges with Multifunctional Function for All DC5-18V Car - Walmart.com
Clinometer + bubble level on the App Store
Clinometer + bubble level - Apps on Google Play
Angle Meter - Apps on Google Play
SOLA Measures App
Amazon.com: MR CARTOOL Automotive Digital Inclinometer M90 Car HUD Roll Pitch Angle Slope Meter for Off-Road SUV Vehicles : Automotive
AUTOOL X90 GPS/OBD2 Slope Meter Inclinometer Car Compass HUD Pitch Tilt - AUTOOL