diff --git a/frmTD_JIG.vb b/frmTD_JIG.vb
index 1886c6c..77fc683 100644
--- a/frmTD_JIG.vb
+++ b/frmTD_JIG.vb
@@ -2544,7 +2544,7 @@ MEASURE_END:
                 Else
                     RegMeasure.MeasureValue(0) = 0
 
-                    If Mid(txbPV_SN.Text, 1, 2) = "J3" Then
+                    If Mid(RegMeasure.MeasurePV_SN, 1, 2) = "J3" Then
                         For Cnt = 1 To RelayCnt.Length - 1
                             If RegMeasure.MeasureValue(RelayCnt(Cnt)) <= EyeMAX And RegMeasure.MeasureValue(0) = 0 Then RegMeasure.MeasureValue(0) = Cnt