Anyone ever used one of these?

https://www.amazon.com/gp/aw/d/B00H862DCM/ref=mp_s_a_1_1?ie=UTF8&qid=1485062053&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=hvac+short+pro&dpPl=1&dpID=51eMn4w6UhL&ref=plSrch

submitted by /u/chase98584
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