How far can a HC-SR04 can stand from the microcontroller? I was wondering if I connect a HC-SR04 to an Arduino or any other microcontroller by normal cables, what would be the maximum length of this cable so that the measurements will still be true, and not affected by the length of this cable?
I have a couple measuring the liquid level of two tanks.

The units are distanced from the microcontroller by 12' of 18ga solid-core copper cable.

Testing was done with another microcontroller with the sensor attached by 6" cable to ensure accurate readings.

That's the longest I needed, so I haven't tested beyond that.