905 nm · Class 1 eye-safe · Long-range flagship
12 grams. 3,000 meters.
The long-reach compact. 905 nm Class-1 DToF that clears 3,000 m on a 70% building target from a 13.5 × 25.1 × 27.8 mm envelope — sized to disappear into a handheld optic, a survey instrument or a UAV payload.
Published price $260 USD / unit
905 nm · Class 1 eye-safe · Gyroscope fusion
10 grams. Range + attitude.
Distance and spatial attitude from one module. An integrated high-precision gyroscope rides alongside 0.1–1,200 m ranging at ±0.2 m, for gimbals and other platforms that move while they measure.
Published price $130 USD / unit
905 nm · Class 1 eye-safe · High-rate industrial
600 meters. 1,000 per second.
A 1 kHz industrial DToF sensor that drops to 50 Hz on its own when the echo weakens — built for traffic safety, shuttle-vehicle anti-collision and overhead-crane positioning on a 9–36 V rail.
Published price $160 USD / unit
905 nm · Class 1 eye-safe · Miniature night engine
5 grams. 1,200 meters.
The lightest engine in the line: a sealed Ø15.7 × 21.3 mm cylinder that reaches 1,200 m by day and 1,500 m at night — for thermal imagers, night-vision devices and compact civil optics.
Published price $130 USD / unit
One wavelength, seven form factors
Every module here is 905 nm, Class-1 and UART-TTL. They differ where it matters to an integrator: reach, weight, and the shape that fits your housing — from a 6 g micro engine to a 3,000 m flagship.
How a module gets chosen
Target, range, accuracy, environment and host limits decide the module. A model name is the output of that conversation, not the input — so we run the same four steps on every enquiry, whether it ends in a standard part or an OEM build.
How integration worksTarget size and reflectivity, required range, accuracy band, update rate, environment and the limits your host imposes.
Optical architecture, beam divergence, measurement cadence and the SWaP envelope that will actually fit the payload.
Mechanics, supply rail, UART-TTL protocol and baud, trigger behaviour and the thermal path through your housing.
Assembly and measured performance against the conditions we agreed — before design release, not after.
Why 905 nm
905 nm direct time-of-flight runs on low-cost silicon detectors — which is what makes these modules small, affordable and Class-1 eye-safe at the same time. For sub-3 km night-vision, thermal and UAV work, it is the wavelength that fits the payload.
Detects on cheap, mature silicon — no exotic receiver, so the module stays compact and cost-effective.
905 nm stays Class-1 under IEC 60825-1 — safe to use and align around people, unlike designators.
Ideal for night vision, thermal clip-ons and UAV gimbals where reach and SWaP have to balance.
Need longer reach or a wider eye-safe margin? Move to 1535 nm on the ERDI global site.
Where these modules earn their keep
Add a precise range readout to a monocular or clip-on without breaking its weight or eye-safety budget. 905 nm stays Class-1 for use around people.
Fit: SPD1200M2 · SPD1200N0 · LR1000B23
Altitude hold, terrain following and target cueing in EO/IR gimbals where every gram of SWaP is contested. Adaptive output trades refresh for reach mid-flight.
Fit: LRF3000A1 · SPD1200S2G · LR1500E2
Perimeter ranging, gate control and trigger sensing with eye-safe emission and IP67 lens cavities for continuous outdoor duty.
Fit: LR1200D23 · LR2000E2 · SPD1200Z2
Obstacle and level sensing for mobile robots, AGVs and fixed process monitoring — the short-range DToF line adds sub-1,500 m sensors from 1 g alongside the continuous-duty industrial series.
Fit: LRF100H · LR1500E2 · SPD1200S2
Meter-class ranging for portable instruments and sport optics — from a body small enough to hold in the objective bell.
Fit: LRF3000A1 · LR1000C3 · LR1000E2
Consistent, repeatable readings across a full working day for total stations, laser levels and mapping rigs.
Fit: LRF3000A1 · LR1500D23 · LR2000E2
905 nm ranging in an EO/IR gimbal payload
Designed and built in-house
We design and build every module in-house — CNC machining, clean assembly and automated calibration under one roof, with more than 15% of revenue reinvested in R&D each year.
905 nm emission stays eye-safe for use and alignment around people.
Shock and vibration qualified for airborne and vehicle platforms.
Sealed optics hold up to dust, rain and continuous outdoor duty.
First-year free replacement, then lifetime technical support.
Quality & compliance documents
A certificate is only meaningful next to its issuing body, its stated scope, the product it names and its validity date. We keep current quality-system and product-compliance documentation on file and supply verification copies for project review.
Built to your spec
We build the modules, so we can change them. Start from a standard model and adapt only what you need — or specify a module from the mechanical envelope out.
Custom housing, mounting and connector to drop into your optical assembly.
UART-TTL tuned to your baud and pinout, or custom driver electronics.
Measurement cadence, output frame, continuous / triggered modes to suit your host.
Laser-engraved branding and packaging for a finished OEM product.
Engineering knowledge path
The same decision chain we walk with an integrator: understand the physics, turn the mission into a requirement, design the interface, verify it, then live with it in the field. Six stages, each with the notes that belong to it.
Who you're buying from
ERDI is a Chengdu-based laser manufacturer with regional offices across North America, Canada, Japan, Singapore and Taipei. We make the 905 nm modules, run the calibration, and stand behind every unit — you talk directly to the engineers who build them.
ERDI TECH LTD · offices
How to read this site
A rangefinder datasheet is easy to write and hard to trust. These are the four rules this site is built on — you can check every one of them on any model page before you talk to us.
Every specification table carries a Source condition column. A maximum range is printed with the target reflectivity and the visibility it was measured under, not on its own.
Unit prices on this site are ERDI’s published prices for the entry quantity band. Where ERDI publishes a volume ladder we show the whole ladder; where it does not, we say the bands are agreed in the quotation rather than inventing them.
There is no chatbot quoting specifications on this site. A request form reaches an engineer, and the technical conditions, quantity and commercial terms are reviewed by a person before anything is confirmed.
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Tell us what you're integrating
Send the platform, the range and accuracy you need, and your volume. We reply with pricing, lead time and the right module — within one business day.
