Coil master 521 mini v2 issue

Hello all,
I have just receved a coil master v3 toolkit for Christmas and when using the included 521 mini v2 to test a coil I'd just built the ohm meter was in 0 or off mode I screwd my RTA in then inserted a Samsung 25r and the coil instantly glowed bright red anyone else had this problem and how to fix if there is a fix
Kind regards,
Daniel Young

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