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Description
SparkFun RTK Express Plus Surveying Kit [SL2]The RTK Surveyor is a Bluetooth enabled multi band GNSS receiver based on the ESP32 from Espressif and the ZED F9P from u blox. Flip the switch and you'll have 300mm approximate accuracy out of the box and 18mm accuracy with RTCM corrections. This kit provides the L1 L2 antenna, adapters, interface cables, and chargers needed for general GNSS use. We generally recommend using your cellular phone as the radio backhaul for RTCM but you can also use your
The RTK Surveyor is a Bluetooth® enabled multi-band GNSS receiver based on the ESP32 from Espressif and the ZED-F9P from u-blox. Flip the switch and you'll have 300mm approximate accuracy out of the box and 18mm accuracy with RTCM corrections. This kit provides the L1/L2 antenna, adapters, interface cables, and chargers needed for general GNSS use.
We generally recommend using your cellular phone as the radio backhaul for RTCM but you can also use your own, higher power radios as long as they support 57600bps. We also recommend logging all data to your phone over Bluetooth. This is as simple as checking a box within SW Maps. But if you prefer to do long surveys, or need to deal with RAWX measurements where a phone will not be present, a microSD card should be purchased (any size up to 32GB).
Please keep in mind that you will need to provide your own mono-pod or tripod as well as a cell-phone type holder for securing the RTK Surveyor to your mono-pod or tripod.
Note: The L1/L2 antenna has a 5/8" thread which will fit most surveying platforms. The kit includes a 5/8" to 1/4" adapter as well which will fit most camera mono-pods and tripods. You may need additional adapters for your specific equipment.
Sparkfun RTK Comparison
RTK Surveyor
A versatile enclosed device that can be used either for centimeter accuracy positioning or as a base station.
| Rover | Base | IMU | Display | Receiver | Antenna | Battery | Application |
|---|---|---|---|---|---|---|---|
| Yes | Yes | No | No |
u-blox
ZED-F9P |
External | 1000mAh | Surveying or Base |
RTK Express
We've taken everything that is good about the RTK Surveyor and upgraded with a display, a better battery and an accelerometer for digital leveling.
| Rover | Base | IMU | Display | Receiver | Antenna | Battery | Application |
|---|---|---|---|---|---|---|---|
| Yes | Yes | No | Yes |
u-blox
ZED-F9P |
External | 1300mAh | Surveying or Base |
RTK Express Plus
RTK Express Plus adds an internal IMU to combine real-time GNSS tracking with advanced sensor fusion. The result is accurate positioning even when GNSS is lost in tunnels, parking garages, etc.
| Rover | Base | IMU | Display | Receiver | Antenna | Battery | Application |
|---|---|---|---|---|---|---|---|
| Yes | No | Yes | Yes |
u-blox
ZED-F9P |
External | 1300mAh | Surveying |
Features
GNSS Receiver: ZED-F9P
- Concurrent reception of GPS, GLONASS, Galileo and BeiDou
- Receives both L1C/A and L2C bands
- Current: 68mA - 130mA (varies with constellations and tracking state)
- Time to First Fix: 25s (cold), 2s (hot)
-
Max Navigation Rate:
- PVT (basic location over UBX binary protocol) - 25Hz
- RTK - 20Hz
- Raw - 25Hz
-
Horizontal Position Accuracy:
- 2.5m without RTK
- 0.010m with RTK
- Max Altitude: 50km (31 miles)
- Max Velocity: 500m/s (1118mph)
Bluetooth® Transceiver: ESP32 WROOM
- Xtensa® dual-core 32-bit LX6 microprocessor
- Up to 240MHz clock frequency
- 16MB of flash storage
- 520kB internal SRAM
- Integrated 802.11 BGN WiFi transceiver
- Integrated dual-mode Bluetooth® (classic and BLE)
- Hardware accelerated encryption (AES, SHA2, ECC, RSA-4096)
- 2.5 µA deep sleep current
Overall Device
- Internal Battery: LiPo 1000mAh with 500mA charging
- Radio Port: 3.3V TTL Serial (57600bps RTCM TX/RX, configurable)
- Data Port: 3.3V TTL Serial (460800bps NMEA, configurable)
- Toggle switch controls
- Weight: 162g (entire device including battery)
- Dimensions: 132mm x 101mm x 32mm (5.2in x 3.9in x 1.2in)
- 1x Qwiic Connector
- 1x microSD Socket for optional logging
GNSS Multi-Band L1/L2 Surveying Antenna
- Gain: ≥5dBi
- LNA Gain: 40dB
-
Reception Frequencies
- L1: 1555 to 1615MHz
- L2: 1198 to 1278MHz
- 50 Ohm Antenna Impedance
- Overall antenna weight: 335g
- Bare antenna element weight (including MMCX connector, with RF shield): 160g
- Dimensions: 148 x 55mm
- Waterproof IP67
- Connector: Female TNC
Included
-
SparkFun RTK Surveyor
RTK Kit Carrying Case
GNSS L1/L2 Multi-Band Antenna - TOP106
Antenna Interface Cable - SMA to TNC (300mm)
1/4" to 5/8" Antenna Thread Adapter
USB Wall Charger - 5V, 2A (USA PLUG)
USB A to C Cable - 0.8m
Data Cable
Radio Cable - RTK Kit Carrying Case
- GNSS L1/L2 Multi-Band Antenna - TOP106
- Antenna Interface Cable - SMA to TNC (300mm)
- 1/4" to 5/8" Antenna Thread Adapter
- USB Wall Charger - 5V, 2A
- USB A to C Cable - 0.8m
- Data Cable
- Radio Cable
Not Included/Optional:
- Camera Mono-pole or Tri-pod
- Phone/Enclosure Holder
- Telemetry Radios - 500mW
- microSD Card - 16GB
Resources
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 1695 reviews
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Product Reviews
★★★★★ 4
Fluoride who?
Size: Pack of 3, 4 Ounce, Set name: B. Whitening
Great product definitely works better than your traditional fluoride or fluoride free toothpaste it actually combats plaque and strengthens the enamel of your teeth I have physically and visibly seen the difference not just in my teeth but gums. Tastes great cleans well clean ingredients the only downside is it's unfortunately very pricey and if you're buying for not just yourself but a family it can start to add up fast just something to consider before purchasing. I love the tube and cap design it's gentle on your gums and teeth and it has good ingredients making the minty flavor taste more natural rather than a synthetic mint flavor and this product actually whitens your teeth. keep in mind that this isn't a replacement for teeth whitening treatments and it's also not a replacement for good dental hygiene like flossing/brushing multiple times a day. If your suffering from serious Dental issues this will not cure it but it is an excellent alternative to fluoride toothpaste that provide little to no benefit for your actual oral and overall dental health. The reason for four not five stars is because of the price I think if they could continue making the same product got the same level of quality for a little less money it would be a five-star item
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 8, 2026
★★★★★ 5
URGENT!!!! REALLY WORKS!!!! Fact ✔️
Size: Pack of 3, 4 Ounce, Set name: B. Whitening
I was immediately convinced this would work due to its ingredients, I had a previous filling fallout. So I immediately requested he apply another filling while I was getting some other dental work done, and the dentist said there was no rush to install, A new filling, showed me a picture. It looked great still white no cavities. In the high definition, microscope photo he showed me,It almost look like the inside of a white Jacuzzi tub with molded seat, I had the rest of the work done and didn’t get to go back soon enough, and the tooth started to bother me when something sweet would hit that spot and I looked in the mirror and it was starting to turn a light brownish color, I had just heard about HA toothpaste, I did some research and this is what I found
Hydroxyapatite = the SAME mineral your teeth are made of
• Your enamel is mostly this material (like 70–97% of tooth structure) 
• So instead of adding a chemical… it’s literally rebuilding with the original material
When you brush with nano-hydroxyapatite:
• Tiny particles fill in microscopic cracks in enamel
• Helps reduce sensitivity
• Can make teeth look whiter naturally (smoother surface reflects light better)
• Strengthens teeth against future damage
so I ordered 3 pack Boka HA and on everything I love in three days of brushing for 2 minutes twice a day morning at night, do not brush your teeth with tapwater ever!!! It has more chlorine than a swimming pool, calcium lead, and other harsh chemicals that will take away the layer it’s going to build always use bottled water and do not rinse this toothpaste out of your mouth. Let it settle in and pack it into your molars and in between your teeth,it was completely healed and no sensitivity to sugar, hot or cold, it tastes great, and the fluoride free is the only way to go fluoride will destroy your tooth enamel, I gave the other two tubes to my kids and they love it, I am looking forward to less dental appointments for sure!!!!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
★★★★★ 5
Five stars for BOKA without hesitation.
Size: Pack of 1, 4 Ounce, Set name: A. Ela Mint
I have tried a lot of natural toothpastes over the years and I can honestly say that Boka completely surprised me in the best possible way. From the very first use it felt like I had finally found a toothpaste that balances modern science with a clean ingredient philosophy. You will not be disappointed.
The standout ingredient here is nano hydroxyapatite, which is the same mineral that naturally makes up tooth enamel. That immediately caught my attention because instead of simply masking dental issues it actually supports remineralization. After learning more about nano hydroxyapatite and how it interacts with enamel I felt confident giving this toothpaste a real trial. The texture is smooth and creamy and it spreads easily across the teeth. Some fluoride free toothpastes can feel chalky or thin but this one feels refined and well formulated. It produces a gentle foam that feels pleasant while brushing but never overwhelming.
The flavor is another area where this toothpaste shines. It is refreshing without being harsh or overly minty. My mouth feels clean and balanced after brushing rather than blasted with artificial intensity. That subtle freshness actually lasts much longer than I expected.
After about two weeks of consistent use I started noticing that my teeth felt smoother throughout the day. That polished feeling you normally get right after a dental cleaning lasted longer than usual. My teeth also appeared brighter which was a welcome bonus.
Another thing I appreciate is the ingredient transparency. There are no questionable additives and it is completely fluoride free which is important for people who prefer alternatives that still support enamel health. Knowing that nano hydroxyapatite is widely used in advanced dental care products in other parts of the world made this even more compelling.
The packaging is clean and modern and the tube dispenses easily without making a mess on the cap. It feels like a premium product from start to finish. What really impressed me is how well this toothpaste balances effectiveness, comfort, and thoughtful formulation. It manages to feel gentle while still leaving my teeth incredibly clean and refreshed. If you are looking for a high quality fluoride free toothpaste that focuses on enamel support and a healthier approach to oral care then I highly recommend giving this one a try. It has absolutely earned a permanent place in my daily routine and it is one of the few natural toothpastes I genuinely look forward to using every day.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 12, 2026
★★★★★ 5
Great toothpaste.
Size: Pack of 1, 4 Ounce, Set name: B. Whitening
This is by far really great toothpaste. I can tell the difference in the color of my teeth. And sometimes my teeth are kinda sensitive to harsh toothpaste. But this is good for sensitive teeth. And minty flavor is not to strong either. Try it. I hope it works for you as well as It does for me. 🤗
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
★★★★★ 4
Gentle and Pleasant to Use
Size: Pack of 2, 1.3 Ounce, Set name: A. Ela Mint
This toothpaste feels gentle on sensitive teeth and has a clean, refreshing taste without being too strong. The texture is smooth, and it leaves my mouth feeling fresh after brushing.
I also like that it uses nano hydroxyapatite instead of fluoride, which makes it an interesting alternative to traditional toothpaste.
Overall, a good toothpaste for sensitive teeth and daily use.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026