About Wall Thickness Gauge – MiniTest 400 Range

The MiniTest 400 is a sturdy and accurate non destructive ultrasonic wall thickness measurement gauge ideal for measuring hard materials such as metal, synthetic material, glass, ceramic etc., and covers a range of shapes and hollow bodies of all kinds like tanks, pipes and more.

Based on the ultrasonic pulse run-time method, we offer three variations of this wall thickness gauge depending on the users requirements and budget.  Users can choose from 6 ultrasonic probes with frequencies ranging between 2 and 10 MHz in different designs offering a broad spectrum of applications and thickness measurements ranging from 0.65 mm to 500 mm.  A high temperature ultrasonic probe is also available, designed for measurement of hot materials with temperatures of up to 350 °C.  The instrument is equipped for automatic detection of the intelligent ultrasonic probes and re-calibration is not required upon switching probes. 

Various measurement modes available:

Standard: The standard mode displays the active measurement reading.

Minimum: The lowest measured value (= thinnest point) is displayed while measuring. This mode is suited for measurement on curved surfaces or to locate the thinnest wall thickness.

Differential: Shows the differential value between the required thickness and the effective thickness measured.

Alarm (Limit): Activates an optical and acoustic alarm when values exceed or fall short of the threshold values.

Scan: Particularly suitable for quick measurements at high material temperatures.

Features & Benefits

  • Non-destructive wall thickness measurement ranging between 0.65 mm and 500 mm
  • High measurement precision and repeatability
  • High resolution of 0.01 mm
  • Scan mode with 10 measurements per second
  • Low voltage memory
  • Minimum mode to detect thinning due to erosion or selective/pitting corrosion
  • Alarm mode with optical and acoustic signals to indicate exceeded limit values
  • Differential mode to indicate deviation from set value
  • Saving and evaluation of measured values by built-in data logger


Non-destructive wall thickness measurement of:

  • Hard materials like metal, synthetic material, glass, ceramic etc.
  • Hollow bodies of all kinds like tanks, pipes etc.


MiniTest 420
Sturdy and economically priced basic model with memory, USB interface and automatic probe-calibration detection. Standard and minimum measurement modes are available.

MiniTest 430
With integrated memory for 10 groups each with maximum 500 measuring values and USB interface. Besides the MiniTest 420 model, the differential, alarm and scanning measuring modes are also available.

MiniTest 440
High-end device with integrated memory for 10 groups each with a maximum capacity of 500 measuring values, USB interface and 5 measuring modes; connecting echo-echo probes is possible.

For further technical specifications, please check the product brochure in the download section.

All Downloads

Filename Size Download
MiniTest 420 430 440 Wall Thickness Measurement Product Brochure 0.96MB Download

Ordering Information

Part Nuymber Description
85-804-0600 MiniTest 420 sturdy, entry level model
85-804-0601 MiniTest 430 extended functional range & USB interface
85-804-0602 MiniTest 440 high-end instrument which can penetrate coatings for measurement
Various probes are available depending on your application. Please speak to our sales team to discuss your requirements.

Scope of Delivery: MiniTest 420 / 430 / 440 instrument, 5 MHz Standard probe, U5.0 for the MiniTest 420 and 430 devices, U5.0E for the MiniTest 440 device, Instruction manual, 2 x 1.5 V battery LR 06 / AA, Protective rubber cover, 1 bottle (200 ml) anti-corrosion coupling agent, Data transmission cable (only for MiniTest 430 / 440), Data transmission software, Plastic case

  • Last updated: June 2024
  • Version: 1.0

Statements, technical information and recommendations contained herein are based on tests we believe to be reliable but they are not to be construed in any manner as warrantees expressed or implied. The user shall determine the suitability of the product for his intended use and the user assumes all risk and liability whatsoever in connection therewith.