I have ordered the micrometer, & I hope it will do the job. There were no gauges given on any strings in the extra set of strings. I have been online emailing every harp site I could over the past month, including the Mid-East Mfg site, the company which built the harp, & harp connection, & the only one which responded advised me to use a micrometer. There are no Music stores in my area which offer strings for non-pedal harps. I will, however, sign up for the harp list! I knew there had to be one out there, I just never ran across it. Thanks all! I'll let you know how it works.