Checkline MX-2 - Manual (Page 19)

MX-2 Ultrasonic Thickness Gauge
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4) To select the units (english or metric), click on the radio button
located to the left of the units title. A black dot will appear in the
button when selected.
5) Click on the Program Gauge button located in the top right of the
window. A pop up window will be display with the following
message “Turn on gauge power”. Press the ON/OFF button on the
MX-2 to download the velocity. The MX-2 will display the new
velocity.