The EX-F1 is a liquid level sensor with an integrated amplifier, thus there is no need to install a separate amplifier. Just attach it to a tube with two tying bands. The position can be easily changed with the release lever even after mounting, so that there is no need to cut the tying bands. Either Light-ON or Dark-ON can be selected by a switch. This is useful to check the operation during installation because it forces the output to be turned ON or OFF even without the liquid being inside the pipe. The built-in output indicator allows for quick verification of the output condition.