This appears to be a remake of the old Agilent calculator, which, though incomplete, was a cool and functional device. This new Keysight calculator, however, confuses return loss with insertion loss and vice versa. It also displays the decibel (dB) as a non-absolute term, which is a gross error. You need to clean this thing up.

This calculator has stopped working and exits as soon as you try to activate a calculation.

Wrong calculations for mismatch loss and RL.

For those familiar with using the old HP reflectometer calculator, this is a nice substitute. You can do most things that you usually do with the slide rule. It's a little easier to carry around than the slide rule, too. My suggestion is to compare the app with your slide rule until you're familiar with what function corresponds to your slide rule. Well done.