add coolant to your system and run the vehicle up to normal operating temperature. Retry the test after the engine has cooled down. The post How To Test Your Car’s Coolant With a Multimeter ...

Ethernet cable testers are dime a dozen, but none of them are as elegant and multimeter-friendly as this tester from our Hackaday.io regular, [Bharbour]. An Ethernet cable has 8 wires, and the 9 ...