Elcometer 204 Steel Ultrasonic Material Thickness Gauge - Discontinued


Replaced by the Elcometer MTG

Pre-calibrated for ease of use, the new Elcometer 204 steel ultrasonic thickness gauge provides fast, accurate measurement of the thickness of steel.

Displays key statistics

In addition to the material thickness measurement, the new Elcometer 204 displays key statistical values required to assess the overall material thickness; number of readings (n), the average material thickness (x), the lowest (Lo) and highest (Hi) material thickness, the standard deviation (σ) and the coefficient of variation (CV%).

Zero Point calibration for accuracy

The new, easy to use, Elcometer 204 has zero point calibration, ensuring accurate thickness measurements on steel surfaces. 

Live data output to PC

As each measurement is taken, the new Elcometer 204 transmits the thickness values via USB straight into an inspection application or into ElcoMaster®, for instant report generation.


Key features of the Elcometer 204 Steel Ultrasonic Material Thickness Gauge include:

  • Pre-calibrated for measuring on steel only
  • Measures steel thickness from 0.63mm up to 500mm (0.025 - 20”)
  • Pre-set measurement rate of 4Hz (4 readings per second) provides faster readings
  • Supplied with everything required for use
  • Measures the material thickness when there is access to only one side
  • Integrated zero disc, ensures maximum accuracy
  • Transfer live readings via USB to ElcoMaster®
  • Intelligent transducer attached with auto-recognition ensures correct probe is identified when the transducer is changed. The Elcometer 204 is supplied with a 5MHz ¼” Potted Right Angle Dual Element Thickness Transducer.

Product Features

Material Thickness Gauge with 5MHz ¼" Dual Element Transducer
Easy to use menu structure in multiple languages
Tough, impact, waterproof & dust resistant; equivalent to IP54
Bright colour screen; with automatic or manual brightness adjustment
Scratch and solvent resistant display; 2.4" (6cm) TFT
Large positive feedback buttons
USB power supply via PC
Gauge software updates1 via ElcoMaster® Software
Data Output
   USB; to PC
2 year gauge warranty2
Auto transducer recognition & ‘V-path’ correction
Reading Rate4 Hz

   Measurement Mode

   Pulsed Echo (PE)0.63 - 500mm±0.1mm (0.63-19.99mm)±0.004” (0.025-0.787”)
(0.025 - 20”)±0.5% (20.00-500.00mm)±0.5% (0.788-20.00”)
Measurement Units
   mm or inches
Repeatability / Stability Indicator
Display Modes
Selectable Reading Resolution
   Lo; 0.1mm (0.01 Inch), 10m/s (0.001 in/μs)

   Number of readings (n), Mean (average) (x),
   Standard deviation (σ), Lowest reading (Lo),
   Highest reading (Hi), Coefficient of Variation (CV%)

Calibration Options
   Zero (using the integrated zero disc)

Technical Specification

Part Number Description
-Elcometer 204 Steel Ultrasonic Material Thickness Gauge with 5MHz ¼" Right Angle Dual Element Transducer
Transducer Probe typeDual Element
Measurement ModePulsed Echo (PE)
Range & Accuracy0.63 - 500mm±0.1mm (0.63-19.99mm)±0.004” (0.025-0.787”)
(0.025 - 20”)±0.5% (20.00-500.00mm)±0.5% (0.788-20.00”)
Resolution0.1mm (0.01")
Reading Rate4Hz (4 readings per second)
Operating Temperature-10 to 50°C (14 to 122°F)
Data OutputUSB
Power Supply2 x AA batteries
Battery Life3Alkaline: Approx. 15 hours
Lithium: Approx. 28 hours
Gauge Weight210g (7.4oz) - including batteries, without transducer
Gauge Dimensions145 x 73 x 37mm (5.7 x 2.87 x 1.46") - without transducer
Packing List

Elcometer 204 steel ultrasonic material thickness gauge, transducer, ultrasonic couplant, carry pouch, screen protector, wrist harness, 2 x AA batteries, operating instructions, calibration certificate and 2 year warranty extension card.

1 Internet connection is required.
2 Elcometer 204 gauge is supplied with a one year warranty against manufacturing defects. The warranty can be extended to two years here.
3 When in continuous reading mode at a reading rate of 4Hz. Rechargeable batteries may differ.


ASTM E 797, EN 14127, EN 15317