Extech TKG250 Quick Start Guide

Quick Start Guide

Ultrasonic Thickness Gauges

Models TKG100 TKG150 & TKG250

Extech Instruments

TKG Series Quick Start Guide - EN v3.5 1/19

1. Installing Batteries

In order to install batteries, open the battery door at the bottom left of the unit. Slide in two ‘AA’

batteries with the positive terminal of both batteries facing towards the top of the unit. Close the
battery door tight enough so that the batteries make good contact with both battery terminals.

2. Powering ON/OFF

To power ON the unit, press and hold the F1 key for approximately three seconds. The LCD will display
the company information briefly and then it will move to the transducer selection screen. These two
screens are as shown below. To switch the unit OFF, press and hold the F1 key for approximately three

seconds. The LCD will briefly display the company information along with a ‘count down’ clock, after

which the instrument will switch OFF.

NOTE: If the Gauge is configured for right-hand operation, the F1 and F3 display prompts will be
reversed. To change from left-hand to right-hand operation, press Menu, Display, and User.

Company information screen Transducer Selection screen

3. Selecting the Transducer type and performing Auto Zero

A new transducer can be selected from the Transducer selection screen (the Transducer selection
appears after the device powers ON).

Note: it is very important that the transducer is not touching the test piece or has any fluid on the face
prior to selecting which probe is to be used.

While in the transducer selection screen, go to the transducer option that matches the part number on
the actual transducer by pressing the up or down arrow key. The unit will briefly display a ‘Wipe off

Couplant’ (fluid) instruction and will then perform an Auto Zero function. During Auto Zero, the unit will
display the text ‘Performing Auto Zero’.