Where can I buy one?
Use the #206 Insulated Muti-Purpose Coupler Height Gauge - HO Scale
Click Here (https://www.kadee.com/ho-scale-tools-and-accessories-c-274_282_316/206-ho-insulated-mutipurpose-coupler-height-gauge-p-315.htm)
Hunt
Thank you. I assume then that Kadee gauge will work with Bachmann rolling stock.
Coupler height is an NMRA standard that all reputable manufacturers follow. Thus the gauge will be accurate no matter whose rolling stock you use it on.
Be ready to buy the Kadee trip pin pliers too. Many pins hang too low, the gauge will tell you.