Remember that the height gauge is made from metal (sturdy), and that it also has a projection to gauge the proper mounting height of the coupler, i.e. you can put the gauge on the track with a car and see where you need to cut or fill to get the coupler mounting pad the correct height. This is besides the obvious function of checking the height of an installed coupler.
To me it's a good deal, considering the total cost of my trains, couplers, etc.
Regards, Greg