Sorry, I'm not familiar with the Abbeon. I have an old (20 + years) Edmund Scientific and a Venta. Neither were cheap. Both work well. The $6 version at Walmart is often recommended on this forum.
I do think it is reassuring to have more than one hygrometer. If they both indicate the same humidity (+ / - 5%) it's likely the number is accurate.
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2009 CA Cargo Raw, 2006 Collings OM-1 SS light build, 2004 Taylor 714ce, 2000 Taylor 310K, 1991 Martin HD-28, 1971 Martin 0-18, 1967 Guild F-30
2006 Ovation Legend 6756LX 12 string, 2004 Taylor 354ce 12 string, 1976 Guild G312-NT 12 string (dreadnaught shape)
1966 Martin T-15 tiple, Mele koa ukulele
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