U1231A/U1232A/U1233A Handheld Multimeter
Understanding the Input Terminals
6 U1231A/U1232A/U1233A Quick Start Guide
Non-contact voltage detector (Vsense)
Voltage could still be present even if there is no alert 
indication. Do not rely on the Vsense detector with 
shielded wire. Never touch live voltage or conductor 
without the necessary insulation protection. 
The Vsense detector may be affected by differences in 
socket design, insulation thickness, and insulation type.
2
AC
Voltage source
S
h
i
f
t
E
s
c
1
> 1 s
3
Press   to change the Vsense detector’s sensitivity from 
Hi.SE (high sensitivity) to Lo.SE (low sensitivity).