The Dakota ZX series comprises the ZX-1 and ZX-3, ultrasonic thickness gauges dedicated to corrosion measurement. The ZX-3 adds adjustable gain (40–52 dB) and high-speed scan at 100 Hz.
- Two models : basic ZX-1 and ZX-3
- ZX-3 scan: High-speed scan at 100 Hz
- Measuring range: Up to 914.4 mm in Pulse-Echo (ZX-3)
- 0.01 mm resolution : Precision on metallic materials
- Pulse-Echo : Standard ultrasonic mode
- 2-point calibration : Accuracy in the field
- P/N Z-300/Z-302 : Official Dakota codes
The Dakota ZX series offers two ultrasonic thickness gauges for corrosion inspection: the basic ZX-1 and the ZX-3 with high-speed scan. The range meets the needs of those looking for a rugged instrument for industrial inspections with excellent value for money, and of those who want to approach ultrasonic technology with a limited investment.
Distinctive features include the extended range up to 914.4 mm (ZX-3), 0.01 mm resolution, two-point calibration with sound velocity compensation and, on the ZX-3 model, adjustable gain and high-speed scan mode. Compatible with Dakota dual-element probes for steel and metal alloys. Extruded aluminium body.
Easy, fast measurement directly in the field
Suitable for maintenance inspections on piping, pressure vessels, industrial structures and components subject to corrosion. Available from RODER SRL, official Dakota NDT distributor, with dedicated calibration, repair and technical support. P/N Z-300-0003 and Z-302-0003, ideal for inspection services. Reference instruments also for technical training and school laboratories.
The Dakota ZX-1 and ZX-3 are the entry-level models in the Dakota ZX series of ultrasonic thickness gauges — reliable, affordable instruments designed for operators who need fast, repeatable measurements without advanced data recording features. Built from extruded aluminium to withstand the harshest environments and covered by a 5-year warranty, these instruments are the economical entry into the world of professional ultrasonic thickness measurement. The ZX-1 is pre-calibrated for steel and ready to use straight out of the case, while the ZX-3 offers an extended measuring range and additional functions such as adjustable gain and high-speed scan.
Need help choosing the right product?
Positioning within the Dakota range
The ZX line is Dakota NDT’s basic range of corrosion thickness gauges. It was designed to be used without specialist training — a key feature for companies that entrust measurements to routine maintenance personnel or workshop operators. The ZX range comprises four models with increasing functionality:
- Dakota ZX-1 — pre-calibrated for steel, manual velocity adjustment (P/N Z-300-0003)
- Dakota ZX-3 — extended range with scan mode and adjustable gain (P/N Z-302-0003)
- Dakota ZX5-DL — adds a 10,000-reading data logger (P/N Z-304-0003)
- Dakota ZX6-DL — top of the range with Echo-Echo Through-Paint mode (P/N Z-306-0003)
The ZX-1 and ZX-3 models do not have a data logger: measurements are displayed in real time but not stored. This is a deliberate choice by Dakota to offer an essential, affordable instrument with a clean interface and no software complications. If you need structured storage, consider the ZX5-DL, the ZX6-DL or the CMX series.
When to choose the ZX-1
The Dakota ZX-1 is the most affordable entry point in the range. It is the right choice when:
- You measure steel only (or alloys with a similar ultrasonic velocity) and do not need to change material frequently
- Part thickness lies in the 1.5 – 200 mm interval
- You want a “switch on and measure” instrument with no initial calibration steps
- Budget is a significant constraint
- Measurements serve as a qualitative/quick check, not as traceable documentation
When to choose the ZX-3
The Dakota ZX-3 is the right choice when:
- You work with different materials (steel, aluminium, copper, brass, cast iron) and need several configurable ultrasonic velocities
- Thicknesses range from 0.63 up to 914.4 mm (the full ZX range)
- You need fast sequential measurements with scan mode
Features common to the ZX-1 and ZX-3
- Standard Pulse-Echo measurement mode
- Dual element transducers with 1 – 10 MHz frequency
- Automatic V-path correction
- Manual Probe Zero via the built-in zeroing disc
- LCD display, 12.7 mm, 4.5 digits, readable in sunlight
- Selectable LED backlight (on/off/auto)
- Selectable mm or inch units
- Extruded aluminium housing
- Powered by 2 AA batteries with up to 45 hours of operation
- 5-year warranty
- NIST and MIL-STD-45662A traceable calibration certificate supplied as standard
ZX-1 vs ZX-3 comparison
| Feature | ZX-1 | ZX-3 |
| Part Number | Z-300-0003 | Z-302-0003 |
| Pulse-Echo range | 1.5 – 200 mm | 0.63 – 914.4 mm |
| Programmable velocities | 1 (steel pre-cal) | Multiple |
| High-speed scan mode | No | Yes |
| Differential mode | No | No (ZX5-DL and ZX6-DL only) |
| Limit alarm mode | No | No (ZX5-DL and ZX6-DL only) |
| Data logger | No | No |
| Price (positioning) | Entry | Entry+ |
Full technical specifications
| Parameter | ZX-1 | ZX-3 |
| Measuring mode | Pulse-Echo | Pulse-Echo |
| Measuring range | 1.5 – 200 mm (0.059 – 8″) | 0.63 – 914.4 mm (0.025 – 36″) |
| Resolution | 0.01 mm (0.001″) | 0.01 mm (0.001″) |
| Velocity calibration range | 305 – 18,542 m/s | 305 – 18,542 m/s |
| Transducer type | Dual element | Dual element |
| Frequency range | 1 – 10 MHz | 1 – 10 MHz |
| V-path correction | Automatic | Automatic |
| Probe Zero | Manual (disc) | Manual or automatic |
| Display | LCD 12.7 mm, 4.5 digits | LCD 12.7 mm, 4.5 digits |
| Backlight | LED (on/off/auto) | LED (on/off/auto) |
| Units of measurement | mm / inches | mm / inches |
| Operating temperature | -30 to +75 °C | -30 to +75 °C |
| Power supply | 2 × AA | 2 × AA |
| Battery life | 45 h alkaline / 23 h NiCd | 45 h alkaline / 23 h NiCd |
| Weight | 312 g (with batteries) | 312 g (with batteries) |
| Dimensions | 63.5 × 131 × 31.5 mm | 63.5 × 131 × 31.5 mm |
| Warranty | 5 years | 5 years |
Compatible probes
The ZX-1 and ZX-3 use Dakota dual element transducers with frequencies between 1 and 10 MHz and a Potted (Side) connector.
| Part Number | Type | Frequency | Diameter |
|---|---|---|---|
| T-104-0000 | Dual element – Standard | 1 MHz | 1/2″ |
| T-102-1000 | Dual element – Standard | 2.25 MHz | 1/4″ |
| T-104-1000 | Dual element – Standard | 2.25 MHz | 1/2″ |
| T-101-2000 | Dual element – Standard | 5 MHz | 3/16″ |
| T-102-2000 | Dual element – Standard | 5 MHz | 1/4″ |
| T-104-2000 | Dual element – Standard | 5 MHz | 1/2″ |
| T-101-3000 | Dual element – Standard | 7.5 MHz | 3/16″ |
| T-101-4000 | Dual element – Standard | 10 MHz | 3/16″ |
| T-102-4000 | Dual element – Standard | 10 MHz | 1/4″ |
| T-102-3300 | Dual element – High resolution | 7.5 MHz | 1/4″ |
For guidance on probe selection, see the guide How to choose the right ultrasonic transducer for each application.
Typical applications
- Corrosion and pitting inspection in industrial plants
- Steel component thickness verification in incoming quality control
- Storage tanks (the ZX-3 in particular, thanks to its extended range)
- Boilers, heat exchangers, steam generators
- Industrial piping and pipelines
- Quick verification measurements in the machine shop
- Marine sector: spot checks on hulls and structures
- Glass industry: thickness control
- Incoming goods quality control to verify dimensional conformity
For further detail on applications and methods we recommend:
- How ultrasonic thickness measurement works: the basic principles
- Thickness measurement in goods-inwards quality control
- 1-point vs 2-point calibration: the differences and when to use each
- Uniform corrosion monitoring: methods, instruments and standards
Scope of supply
- Dakota ZX-1 or ZX-3 instrument
- Dual element transducer of your choice
- Ultrasonic couplant
- User manual
- Rigid carrying case
- NIST traceable calibration certificate
- 2 AA batteries
Note: the DakMaster™ software and the data transfer cable are included only with the data logger models (ZX5-DL and ZX6-DL), not with the basic ZX-1 and ZX-3 models.
Standards and certifications
- NIST traceable factory calibration
- MIL-STD-45662A compliance
- CE marking with certificates (FCC ICES, EN 61326)
- EN 14127 compliance (Ultrasonic thickness measurement)
- ASTM E797 compliance (Standard practice for measuring thickness by manual contact ultrasonic methods)
For the full picture of the reference NDT standards, see NDT standards for thickness measurement: EN 14127, ASTM E797 and EN 15317.
Frequently asked questions
The ZX-1 is pre-calibrated for steel only, with a range of 1.5-200 mm, and offers essential features. The ZX-3 has a much wider range (0.63-914.4 mm), supports multiple ultrasonic velocities for different materials and adds high-speed scan and adjustable gain.
No, both models operate in Pulse-Echo mode only and require clean surfaces (or removal of the coating) for accurate base-metal measurement. If You need to measure painted surfaces without removing the paint, You need the Dakota ZX6-DL (Echo-Echo Through-Paint mode) or a model from the CMX line.
No. Neither the ZX-1 nor the ZX-3 stores measurements: they are only shown on the display in real time. If storage for reporting is required, choose the ZX5-DL, ZX6-DL or a model from the CMX/MX line.
Dakota provides a 5-year manufacturer’s warranty across the whole ZX line, one of the longest warranties in the industry for this product category.
Yes, the ZX-1 is supplied factory pre-calibrated for the ultrasonic velocity of steel. It is ready to measure as soon as it is switched on. The velocity can still be adjusted manually within the 305-18,542 m/s range to suit other materials, but the purpose of the ZX-1 is immediacy on steel.
Request a quotation for the Dakota ZX-1 or ZX-3
Our technical team will help You choose the model best suited to Your inspection needs. Contact us for tailored advice or to arrange a demonstration.
Documentation download
Official Dakota NDT technical documentation. Files open in a new tab.
 | ZX1 Datasheet | Datasheet |
| ZX3 and ZX5-DL Datasheet | Datasheet |
| ZX1 User Manual | Manual |
| ZX3 User Manual | Manual |
| ZX5-DL User Manual | Manual |
Dakota ZX line and CMX1-DL
DAKOTANDT ZX SERIES – INSTRUMENTS
| Part Number | Description |
|---|---|
| Z-300-0000 | ZX1 Ultrasonic Dual Element Corrosion Thickness Gauges, PE |
| Z-302-0000 | ZX3 Ultrasonic Dual Element Corrosion Thickness Gauges, PE |
| Z-304-0000 | ZX5-DL Ultrasonic Dual Element Corrosion Thickness Gauges, PE – DataLog |
| Z-306-0000 | ZX6-DL Ultrasonic Dual Element Corrosion Thickness Gauges PE/EE – DataLog |
SPARE PARTS / ACCESSORIES ZX & PZX
| Part Number | Description |
|---|---|
| F-302-0001 | ZX & PZX Gauge Series Instrument Case: Nylon |
| A-302-6002 | ZX & PZX Gauge Series Instrument Case: Rubber |
| A-302-6003 | ZX & PZX Gauge Series Plastic Transit Case |
| N-003-0330 | USB-C to USB TYPE A 3′ Data Cable – V2.0 Gauges |
DUAL TRANSDUCERS – Compatible with ALL ZX models
| Part Number | Type | Frequency | Diameter | Connector |
|---|---|---|---|---|
| T-104-0000 | Dual Element – Standard | 1 MHz | 1/2″ | Potted (Side) |
| T-102-1000 | Dual Element – Standard | 2.25 MHz | 1/4″ | Potted (Side) |
| T-104-1000 | Dual Element – Standard | 2.25 MHz | 1/2″ | Potted (Side) |
| T-101-2000 | Dual Element – Standard | 5 MHz | 3/16″ | Potted (Side) |
| T-102-2000 | Dual Element – Standard | 5 MHz | 1/4″ | Potted (Side) |
| T-104-2000 | Dual Element – Standard | 5 MHz | 1/2″ | Potted (Side) |
| T-101-3000 | Dual Element – Standard | 7.5 MHz | 3/16″ | Potted (Side) |
| T-101-4000 | Dual Element – Standard | 10 MHz | 3/16″ | Potted (Side) |
| T-102-4000 | Dual Element – Standard | 10 MHz | 1/4″ | Potted (Side) |
| T-102-3300 | Dual Element – Extra Resolution | 7.5 MHz | 1/4″ | Potted (Side) |
DUAL TRANSDUCERS – Hi-Damped (Echo-Echo)
| Part Number | Type | Frequency | Diameter | Connector |
|---|---|---|---|---|
| T-101-2700 | Dual Element – Hi-Damped / EE | 5 MHz | 3/16″ | Potted (Side) |
| T-102-2700 | Dual Element – Hi-Damped / EE | 5 MHz | 1/4″ | Potted (Side) |
| T-104-2700 | Dual Element – Hi-Damped / EE | 5 MHz | 1/2″ | Potted (Side) |
| T-102-3700 | Dual Element – Hi-Damped / EE | 7.5 MHz | 1/4″ | Potted (Side) |
ULTRASONIC COUPLANT
| Part Number | Description |
|---|---|
| GEL-ACC-STD | Yellow rust-inhibiting couplant gel, RCCM compliant. Standard temperature range 0 / 80 °C. 500 ml pack |
| GEL-ACC-EXT | Blue corrosion-inhibiting couplant gel, RCCM compliant. Extended temperature range -20 / 120 °C. 500 ml pack |
| PST-ACC-MHT | Special paste for ultrasonic coupling at medium temperature, -30 / +300 °C. Non-flammable and produces no fumes. RCCM compliant. 170 g pack |
| PST-ACC-UHT | Special paste for ultrasonic coupling at very high temperature, +100 / 520 °C. Non-flammable and produces no fumes. RCCM compliant. 200 g pack |
CALIBRATION BLOCKS
| Part Number | Description |
|---|---|
| X-000-0001 | Calibration Block: 5 Step; 0.1 – 0.5″; 4340 Steel |
| X-000-0002 | Calibration Block: 4 Step; 0.25 – 1.0″; 4340 Steel |
| X-000-0022 | Calibration Block: 5 Step; 2.5 – 12.5mm; 1018 Steel |
| X-000-0021 | Calibration Block: 4 Step; 6.25 – 25mm; 1018 Steel |
| X-000-0005 | Calibration Block Carry Case |
MISCELLANEOUS ACCESSORIES
| Part Number | Description |
|---|---|
| F-000-7001 | Bell Shaped Spring Loaded Probe Holder (V-Block) – Dual Transducer Tube Inspection |
Further information and contacts
Systems division and sensor integration partner : www.roder.it
More information about RODER SRL : about us
Contact for general information : info@roder.it
Contact for information about these products : info@roder.it
The information contained on this web page is provided for information purposes only. Although it has been compiled with the utmost care, it does not constitute a contractual offer or a binding commitment to supply. It may contain transcription, translation or typographical errors. For precise and up-to-date information, please contact our company directly.
Some images on this website have been intentionally generated using Artificial Intelligence (AI). This is because, for many applications and projects, it is not possible to disclose photographs of the installation or of the actual system due to confidentiality agreements, confidentiality clauses and non-disclosure agreements (NDAs).