Jim Sounds like a Measurements model 59. Does it have a rotary switch to select three functions on the main power/meter unit? Also, the 'head" (RF unit) is round, not octagonal like a stop sign? They made another unit with the octagon shape. I have one, and a manual. If you want, give me your address and I can copy/mail to you (if yours is a 59). John K5PRO