Recommended Hardware

Fleet Telematics Hardware

WeighStation integrates with Freematics open-source OBD-II telematics devices for real-time GPS tracking, engine diagnostics, and fleet monitoring. Plug-and-play with any OBD-II or HD-OBD equipped vehicle.

Plug & Play OBD-II
No Monthly Device Fees
Open-Source Firmware
Works with WeighStation

Choose Your Telematics Device

All devices plug directly into your vehicle's OBD-II diagnostic port. No wiring, no installation labor.

Best for Fleets
Freematics ONE+ Model B OBD-II GPS Tracker
4G LTE Bluetooth WiFi

Freematics ONE+ Model B

LTE CAT-1 cellular + WiFi + BLE. Ideal for real-time fleet tracking over cellular networks. Requires SIM card for data.

$129.00
  • ESP32 dual-core processor (16MB Flash, 8MB PSRAM)
  • SIM7670 LTE CAT-1 cellular modem + SIM slot
  • u-blox M10 GNSS — GPS, GLONASS, Galileo, BeiDou
  • ICM-42627 6-axis motion sensor (G-force, motion)
  • OBD-II PIDs, DTC, VIN + CAN bus sniffing
  • WiFi 802.11 b/g/n + Bluetooth Classic & BLE
  • Car battery voltage monitoring
  • microSD slot (up to 32GB local logging)
  • Integrated buzzer for driver alerts
  • 60 × 48 × 20mm — plugs directly into OBD-II port
Best for: Trucks and service vehicles that need always-on cellular GPS reporting, geofence alerts, and live driver tracking on the WeighStation dispatch map.
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Heavy Duty
Freematics ONE+ Model H Heavy Duty OBD-II Tracker
4G LTE CAT4 Bluetooth J1939

Freematics ONE+ Model H

Heavy-duty 12V/24V with HD-OBD connector. 4G LTE CAT4 for high-speed data. Supports SAE J1939 protocol for commercial trucks.

$150.00
  • ESP32 dual-core processor (16MB Flash, 8MB PSRAM)
  • SIM7600A-H or SIM7600E-H 4G LTE CAT4 modem
  • Supports 12V passenger and 24V heavy-duty vehicles
  • SAE J1939 PGN/SPN + standard OBD-II protocols
  • u-blox M10 GNSS — multi-constellation positioning
  • ICM-42627 6-axis motion sensor
  • WiFi 802.11 b/g/n HT40 + Bluetooth dual mode
  • HD-OBD (Type B) male connector for commercial vehicles
  • microSD slot (up to 32GB), microUSB port
  • 60 × 48 × 20mm — compact plug-in form factor
Best for: Class 6–8 commercial trucks, roll-off vehicles, and heavy equipment with 24V systems and J1939 diagnostic buses used in waste and recycling fleets.
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Freematics ONE+ Model A OBD-II Device
Bluetooth WiFi

Freematics ONE+ Model A

WiFi + BLE base model. Pairs with driver's phone via Bluetooth for data relay. Optional cellular module via xBee socket.

$79.90
  • ESP32 main controller (16MB Flash, programmable)
  • WiFi 802.11 b/g/n + Bluetooth Classic & BLE
  • OBD-II PIDs, DTC, VIN + CAN bus sniffing
  • ICM20948 motion sensor
  • u-blox M10 GNSS (external receiver, optional)
  • xBee socket for optional cellular module
  • Car battery voltage monitoring
  • microSD slot, microUSB port, SIM slot
  • Ultra-low power: 20mA idle / 50mA WiFi active
  • 60 × 48 × 20mm — standard OBD-II connector
Best for: Budget-conscious fleets using the WeighStation driver app on phones. The device transmits via BLE to the driver's phone, which relays data to WeighStation over cellular.
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How It Works with WeighStation

1. Plug In

Insert the Freematics device into your vehicle's OBD-II port. No wiring or mechanic needed.

2. Connect

Insert a SIM card for cellular models, or pair via Bluetooth to the driver's phone.

3. Register

Add the device in WeighStation's OBD Device Manager and assign it to a vehicle in your fleet.

4. Track

Real-time GPS, speed, fuel, and engine data streams into WeighStation's live map and dispatch board.

Comparison

Choose the right device for your fleet needs

Feature Model A
$79.90		 Model B
$129.00		 Model H
$150.00
Cellular DataOptional add-onLTE CAT-14G LTE CAT4
WiFi✓✓✓
Bluetooth (BLE)✓✓✓
Built-in GPS/GNSSExternal only✓✓
OBD-II (12V Cars)✓✓✓
HD-OBD (24V Trucks)——✓
SAE J1939——✓
CAN Bus Sniffing✓✓✓
Motion Sensor✓✓✓
microSD Storage✓✓✓
Buzzer (Alerts)—✓✓
Recommended ForPhone-tethered trackingGeneral fleet trackingHeavy-duty commercial

Frequently Asked Questions

For the Model B and Model H (cellular models), yes — you'll need a data SIM card. Any carrier with 4G/LTE coverage works. Typical data usage is under 50MB/month per device. The Model A uses Bluetooth to relay data through the driver's phone, so no SIM is needed.
Plug the device into your vehicle's OBD-II port, then go to Assets > OBD Devices in WeighStation. Add the device by its serial number, select the vehicle to assign it to, and the system will begin receiving telemetry data within minutes.
Model B is our top recommendation for most fleets — it has built-in 4G LTE, GPS, and works independently without needing the driver's phone. Model H is required for Class 6–8 trucks with 24V electrical systems and J1939 diagnostic protocols. Model A is the budget option that pairs with the driver's phone for data relay.
No. WeighStation's $1,500/month platform fee includes unlimited OBD devices, unlimited vehicles, and unlimited users. The only hardware cost is the one-time purchase of the Freematics device itself.
Real-time GPS coordinates, vehicle speed, RPM, engine load, coolant temperature, fuel level, odometer readings, battery voltage, G-force events (hard braking, sharp turns), DTC fault codes, and VIN. This data powers live tracking, HOS compliance, fuel analytics, geofence alerts, and driver scorecards.

Need Help Choosing?

Our team can recommend the right Freematics devices for your fleet size, vehicle types, and coverage requirements.

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