1.wonderful accuracy and stability 2.best cost performance 3.selling around world already 3.accept OEM FUNCTION1.in measurement mode,press HOLD/LIGHT button in short time is locked measurement value and this time the hold botton show measure is invalid.2.press HOLD/LIGHT button in short time again back to measurement pattern.3.on work status press HOLD/LIGHT button as long as 2 seconds switch ...
