FM experimenters have only the field strength guidelines so measuring field strength is a critical task. The maker of this kit says “This Field Strength Meter has been specially designed for very low power transmitters and will assist enormously in adjusting and tuning for optimum output.”
Learn more about this kit and get ordering info here:
NOTE: This vendor is loacated in Austrailia, and scwis has ordered from vendors there several times. The orders show up in about a week, and are sent USPS priority mail. Inexpensive and painless. I’ll make a note to write up Aussie sources for a future entry.