Topcon AT-B4A vs Myzox CL-28 Auto Level Comparison Malaysia
The **Topcon AT-B4A** and **Myzox CL-28** are automatic levels suitable for construction, drainage, earthwork and general levelling applications in Malaysia.
The CL-28 offers higher 28x magnification and a lighter body, while the AT-B4A provides closer focusing, magnetic-damped compensation and a higher published water-resistance rating.
Both models have a published levelling accuracy of **2.0mm per 1km double-run levelling**.
## Quick Specification Comparison
| Specification | Topcon AT-B4A | Myzox CL-28 |
|---|---:|---:|
| Magnification | 24x | 28x |
| Levelling accuracy | 2.0mm per 1km double run | ±2.0mm per 1km double run |
| Field of view | 1°25′ | 1°20′ |
| Minimum focus | 0.2m from telescope end | 0.4m |
| Self-levelling range | ±15′ | ±15′ |
| Horizontal-circle reading | 1° / 1 gon | 1° |
| Water and dust protection | IPX6 water resistance | IP54 |
| Approximate body weight | 1.5kg | 1.3kg |
Specifications may change, so confirm the current product information before ordering.
## Does 28x Magnification Mean Better Accuracy?
No. Higher magnification makes the staff image appear larger, but it does not automatically mean that the instrument is more accurate.
Both models publish the same 2.0mm accuracy class for 1km double-run levelling.
The **Myzox CL-28’s 28x magnification** may help users who prefer a larger staff image, particularly at longer practical observation distances.
The **Topcon AT-B4A’s 24x magnification** remains suitable for routine construction and drainage work.
## When to Choose the Topcon AT-B4A
The AT-B4A may be the better choice when:
- The company already uses Topcon equipment
- Outdoor water resistance is a priority
- The instrument will be used near machinery or traffic
- Short-focus measurements are required
- Local Topcon service familiarity is important
- Contractors require a dependable general-purpose auto level
Its 0.2m minimum focus from the telescope end can be useful inside buildings or near walls and structural elements.
## When to Choose the Myzox CL-28
The CL-28 may be suitable when:
- Higher 28x magnification is preferred
- A lighter instrument is useful
- The project involves regular staff reading
- The buyer wants an entry-level Myzox auto level
- The instrument is used for general construction work
- The purchasing decision prioritises value and portability
Its published body weight of approximately 1.3kg may benefit teams that move frequently around a project site.
## Outdoor Protection Comparison
The Topcon AT-B4A carries an **IPX6 water-resistance rating**.
The Myzox CL-28 carries an **IP54 dust- and water-resistance rating**.
These ratings are not identical:
- IPX6 specifies resistance to powerful water jets but does not state a dust rating.
- IP54 specifies limited dust protection and protection against water splashes.
Neither instrument should be submerged. Both should be dried properly before storage after wet-weather use.
## Construction Applications
Both models can support:
- Foundation-level checking
- Finished-floor measurement
- Drainage gradients
- Excavation depth
- Cut-and-fill work
- Road and pavement construction
- Landscaping
- Factory and warehouse projects
- General elevation transfer
The correct model should be chosen according to the project tolerance, observation distance and working environment.
## Using a 5m Levelling Staff
Both instruments can be paired with a standard 5m staff or a branded option such as the **Myzox ALG55Y**.
For dependable measurement:
- Check that the staff is straight
- Lock all telescopic sections
- Keep the staff vertical
- Use a stable measuring point
- Remove telescope parallax
- Record readings carefully
- Repeat unusual results
The auto level cannot compensate for a leaning or damaged staff.
## Indoor and Confined Work
For close-range work, the Topcon AT-B4A has the shorter published minimum focusing distance.
This may help when measuring:
- Near walls
- Inside narrow rooms
- Around columns
- In plant rooms
- On renovation sites
The tripod must still be positioned securely with enough working space for the operator.
## Site Transport and Handling
The Myzox CL-28 is lighter, but both instruments require careful transport.
Good practice includes:
- Returning the instrument to its case after use
- Securing the case inside the vehicle
- Avoiding heavy items on top of the case
- Keeping moisture out of the case
- Checking accuracy after impact
- Preventing unauthorised adjustment
An auto level can lose accuracy even when there is no obvious exterior damage.
## Which Auto Level Should You Buy?
Choose the **Topcon AT-B4A** when close focusing, magnetic-damped compensation, outdoor water resistance and Topcon brand preference are important.
Choose the **Myzox CL-28** when 28x magnification, lower body weight and Myzox value positioning are more important.
Because both have the same published levelling accuracy class, the final decision should consider:
- Working distance
- Site conditions
- Instrument handling
- Brand preference
- Budget
- Calibration and repair support
- Tripod and staff requirements
MTM Precision supplies Topcon and Myzox surveying equipment and supports Malaysian contractors with product selection, checking, calibration and repair assessment.
Contact us with your application, working distance and preferred setup for a suitable recommendation.
**MTM Precision Sdn Bhd**
**Showroom & Service Centre:** No. 29-1 & 29-2, Jalan Bandar 18, Pusat Bandar Puchong, 47160 Puchong, Selangor, Malaysia
**Tel:** 03-8080 7172
**WhatsApp:** +6016-660 7346
**Email:** mtmpre@yahoo.com
**Website:** www.mtmpre.com.my
23 Sep 2026
