Dual Laser Structural Movement Telemeter YZ-120Pro

Real-Time Structural Movement Monitoring That Keeps Rescue Teams Safe

After an earthquake, a fire or a collapse, a damaged building can fail again at any second. The LSJ YZ-120Pro Dual Laser Structural Movement Telemeter is built for that window: it continuously watches the structure and tells your team, in real time, whether a wall, a column or a slab has started to move — before that movement becomes a collapse.

Using an eye-safe laser and wireless inclinometers, the YZ-120Pro measures displacement at 1 mm resolution and tilt at 0.1°, monitors two laser points plus up to four tilt channels from one tripod, and triggers an unmissable audible, visual and voice alarm the moment a preset threshold is crossed. It is the safety net between your crew and the next collapse.

Figure 1: LSJ YZ-120Pro dual laser telemeter on its tripod — two laser channels and up to four wireless inclinometers from a single unit.

The YZ-120Pro is a complete monitoring station in one rugged package: dual laser rangefinders for displacement, a built-in OLED display and camera, wireless host control, and an optional Android terminal for command-post supervision. Every component is designed for one objective — fast, reliable collapse-risk awareness on site.

Figure 2: Front view of the YZ-120Pro — dual optical channel, 4-inch OLED split-screen display and direct control keys for one-handed operation.

Dual-Laser Precision — Two Points Watched, One Operator

Two independent red laser rangefinders measure two target points at the same time, doubling the coverage of a single-beam instrument without a second tripod or a second operator. When a monitored point moves by more than the set threshold, the corresponding channel triggers the alarm immediately — you know not only that something moved, but where.

• 1 mm displacement resolution — catches millimeter-level movement that indicates a structure is starting to fail.
• Stepless alarm threshold, 1–999 mm — fixed presets or fully user-defined values for each channel.
• Adjustable gating (0–99 m) — masks reflections between the window and the set value so nearby objects never trigger false alarms.
• Green aiming laser + 4×32 telescope — precise point alignment at long distance, day or night.

Figure 3: YZ-120Pro dual laser interface — Laser 1 / Laser 2 distance, gating and alarm threshold on the left, live camera view on the right.

Displacement + Tilt: One Integrated Wireless System

Movement is never only horizontal. The YZ-120Pro fuses laser displacement with up to four wireless inclinometers, each reporting X / Y / Z tilt at 0.1° resolution. Place one on a leaning wall, another on a cracked column — the host terminal shows distance, tilt and battery status for every sensor on a single screen.

Figure 4: The complete YZ-120Pro system — dual laser telemeter plus four wireless inclinometers covering displacement and tilt at once.

Each inclinometer is battery powered, links wirelessly to the host, and is placed in seconds — no cabling, no power runs. The result is a monitoring perimeter that covers both what moves toward you (displacement) and what is starting to lean or rotate (tilt), from one compact kit.

Figure 5: A YZ-120Pro wireless inclinometer unit — self-contained X / Y / Z tilt sensing with independent alarm thresholds.

Smart Host Display — See Every Sensor at a Glance

The YZ-120Pro host pairs a 4-inch OLED display (800 × 480) with an integrated visible-light camera. The split-screen view shows laser status and live video at the same time — compare the two monitored points, take photos and record video without extra equipment. Battery and wireless status for every connected sensor stay on screen, so a dying sensor never surprises you.

• Dual-view: laser measurement + live camera, one screen.
• Photo capture and video recording built in (long-press keys).
• Optical zoom 4.5–50 mm (10×) with auto focus for close inspection of the monitored area.
• LoRa / WiFi / 4G (optional) — data mirrors to the optional EM-T81X Android host terminal for command-post viewing.

Figure 6: YZ-120Pro host OLED interface — two laser channels, four inclinometers (X / Y / Z), alarm thresholds, battery and wireless status on one screen.

An Alarm Your Team Cannot Miss

On a noisy collapse site, a subtle warning is no warning. The YZ-120Pro raises the alarm three ways at once: a loud siren above 110 dB, a flashing visual beacon, and clear voice prompts. Voice alerts cover over-close, over-far, abnormal readings and low battery — so operators know what happened, not just that something did. Alarms can be acknowledged and silenced manually when the situation is confirmed safe.

• Audible + visual + voice alarm >110 dB (measured 110.1 dB at 1 m).
• Voice prompts: over-close, over-far, abnormal reading, low battery.
• Optional standalone sound-and-light alarm terminal linked wirelessly.
• One-key reverse search — the monitor and inclinometers flash and sound to locate themselves on site.

Figure 7: Optional LSJ sound-and-light alarm terminal — flashes and sounds in sync with the YZ-120Pro host when movement is detected.

Built for the Collapse Scene — Proven in Real Rescue Operations

The YZ-120Pro is engineered for the worst-case sites where structure stability decides everything. Set up on a tripod beside the danger zone, it watches the damaged structure while teams work — and warns the moment the numbers start to move.

• Earthquake rescue — monitor debris piles and leaning walls for secondary collapse while searching survivors.
• Building collapse — watch residual walls, columns and slabs; monitor the effect of every cutting or lifting operation.
• Structure fire — track heat-affected load-bearing walls and adjacent buildings for early deformation signs.
• Hazardous-material incidents — monitor tank displacement and warehouse structures around chemical leaks.
• Landslide & tunnel risk — continuous slope and portal movement surveillance for site safety.

Figure 8: YZ-120Pro deployed on a collapsed building site — the monitor watches the structure while teams work inside the danger zone.

One Case, One Trip — Rugged Kit Ready for the Field

Everything ships in a shockproof transport case with foam cutouts for every component — monitor, tripod, inclinometers, antennas and charger. The case survives transport in fire-service vehicles and field storage, and the whole system is ready to monitor in minutes: mount the tripod, aim with the green guide laser, power on and confirm the built-in simulated test.

Figure 9: Shockproof transport case — designed for fire-service vehicles and repeated field deployments.

Standard package contents: dual laser displacement monitor, tripod, wireless inclinometers, antennas, dedicated charger, user manual and shockproof transport case. The host terminal (EM-T81X) and standalone alarm beacon are optional add-ons.

Figure 10: Complete YZ-120Pro kit in its foam-lined case — one trip, one setup, full monitoring coverage.

Frequently Asked Questions

Q: How far can the YZ-120Pro measure, and how accurate is it?

A: The YZ-120Pro measures displacement with 1 mm resolution over a range of ≥100 m (up to 110 m at night). Tilt is measured at 0.1° resolution across X / Y / Z axes. An adjustable gating window (0–99 m) masks nearby reflections so they never disturb the reading.

Q: How many points can one unit monitor at the same time?

A: Two laser points simultaneously, plus up to four wireless inclinometers reporting X / Y / Z tilt — all from a single tripod and a single host, with one operator.

Q: What happens when movement is detected?

A: The host triggers an audible alarm above 110 dB together with a visual beacon and voice prompts, and the optional alarm terminal sounds in sync. Alarm thresholds are stepless adjustable from 1 to 999 mm; alarms can be manually acknowledged once the area is confirmed safe.

Q: How quickly can the system be deployed on site?

A: Deployment takes minutes: unfold the tripod (S-hook ballast for stability), mount the monitor, aim the two laser points with the green guide laser or the 4×32 telescope, power on and run the built-in simulated test. No cables, no network configuration — everything links wirelessly to the host.

Q: What environments can the YZ-120Pro withstand?

A: Operating temperature is -20 °C to +60 °C, storage -40 °C to +70 °C. The removable 7.4 V Li-ion battery runs ≥8 hours with on-screen charge display; charging is Type-C, and the host can recharge the monitor and inclinometers in the field.

Q: How does the monitoring data reach the command post?

A: Sensors link to the host over LoRa; WiFi and 4G (optional) extend the link. The optional EM-T81X Android terminal (8", IP65, 1.2 m drop resistant) receives the data for command-post supervision and logging.

Q: Is the laser safe for operators and bystanders?

A: The YZ-120Pro uses an eye-safe laser design. As a safety rule, never look directly into the green aiming beam: it auto-sleeps after 2 minutes of continuous use, and the device must not be aimed at glass within 1 m or at fully reflective surfaces.

Q: What is included in the package?

A: Dual laser displacement monitor, tripod, wireless inclinometers, antennas, dedicated charger, user manual and shockproof transport case. The host terminal (EM-T81X) and the standalone sound-and-light alarm terminal are available as options.

Technical Specifications

Verified values from the LSJ YZ-120Pro production configuration. Optional items are marked.