Hi, I'd try to find units with an external probe. The dogone things drift out of calibration--and it is much easier to send a probe back for recalibaration than an entire unit. For that matter one could have extra probes "on hand". Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. Non calor sed umor est qui nobis incommodat mailto:pianotuna at yahoo.com http://www.donrose.ca/ 3004 Grant Rd. REGINA, SK, S4S 5G7 306-539-0716
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