Our altimeters & flight computers
The Nano V1 is one of the smallest altimeters available at just 1.35g — ideal for competition altitude records and minimum-diameter rockets where weight is critical. It records at 50 Hz using a high-accuracy Bosch pressure sensor with Kalman filtering, stores SHA-256 signed logs that prove your record is genuine, and charges and downloads via any USB port with no software required.
The Mercury V1 is a full flight computer that still fits an 18mm tube, adding accelerometer, gyroscope, tilt angles, dual-deploy outputs, and WiFi sync to the Altimeter Cloud. The upcoming Neptune and Jupiter push further — 200 Hz logging, four 30A protected outputs, and in the Jupiter, live cellular telemetry from anywhere on the planet.
Full specification comparison
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Mercury
Available£56.99Mercury PLUS
ETA Apr 26TBC
Nano V1
Available£TBC
Neptune
ETA Jul–Sep 26TBC
Jupiter
ETA Jul–Oct 26TBC Physical
Max altitude
~9,000 m / 30,000 ft
~9,000 m / 30,000 ft
~9,000 m / 30,000 ft
~20,000 m / 60,000 ft
~20,000 m / 60,000 ft
Size
39.5×19.2×13.9mm
30×17×12.3mm bare
30×17×12.3mm bare
39.5×19.2×13.9mm
30×17×12.3mm bare
30×17×12.3mm bare
19.0×10.0×8.7mm
58×22×20mm
60×22×20mm
Weight
7.35g / 4.6g bare
7.35g / 4.6g bare
1.35g
16g inc. battery
TBC inc. battery
Sensors
Pressure sensor
BMP390 (r1/2), BMP581 (r3)
BMP581 (r1)
BMP390 (r1–3), BMP581 (r4)
Dual inc. BMP581
Dual inc. BMP581
Accelerometer
3-axis 32G
6-axis 256G
3-axis 32G (r4+)
6-axis 256G & 16G
6-axis 256G & 16G
Gyroscope
3-axis 2000 dps
3-axis 4000 dps
3-axis 2000 dps (r4+)
3-axis 4000 dps
3-axis 4000 dps
Magnetometer
—
—
—
3-axis
3-axis
GNSS / GPS
—
—
—
—
U-blox M10
Tilt / orientation
6-axis fusion
9-axis fusion
—
12-axis fusion
12-axis fusion
Connectivity
WiFi
✓
✓
—
✓
✓
Cellular
—
—
—
—
LTE-M & NB-IoT
Included SIM
—
—
—
—
10 yr line rental
Configure via Cloud
✓
✓
✓
✓
✓
Configure offline
USB drive
USB drive
—
USB drive
USB drive
Expansion ports
1× I2C, 2× GPIO
1× I2C, 2× GPIO
—
1× I2C, 2× GPIO, 1× MEM
1× I2C, 2× GPIO, 1× MEM
Outputs
High-current outputs
1× 12A (3A cont)
2× 15A (7A cont)
—
4× 30A (8A cont)
4× 30A (8A cont)
Servo channels
2 onboard + I2C
2 onboard + I2C
—
4 onboard + I2C
4 onboard + I2C
Solder-free wiring
Through-hole
Through-hole
—
✓
✓
Output resistance mon.
—
—
—
✓
✓
Output current logging
—
—
—
✓
✓
Power & Storage
Processor
1× 160 MHz
1× 160 MHz
1× 240 MHz
2× 240 MHz
2× 240 MHz
Storage
4 MB (2 MB flights)
4 MB (2 MB flights)
4 MB (2.8 MB flights)
260 MB (256 MB flights)
260 MB (256 MB flights)
Battery life
6 hrs
6 hrs
5 hrs
5 hrs (int. bat.)
4 hrs (int. bat.)
Rechargeable
✓
✓
✓
✓
✓
Ext. power connector
Solder pads
Solder pads
—
XT30
XT30
Recoverable flight data
Redundant flash buf.
Redundant flash buf.
—
Buffer + memory port
Buffer + memory port
Flight features
Turn on & fly
✓
✓
✓
✓
✓
Dual deployment
✓
✓
—
✓
✓
Flight computer
✓
✓
—
✓
✓
Data logging rate
50 Hz / 21 datasets
50 Hz / 21 datasets
50 Hz / 5 datasets
200 Hz / 35+ datasets
200 Hz / 35+ datasets
Apogee detection
Within 300ms
Within 300ms
Within 300ms
Within 300ms
Within 300ms
Burnout detection
✓
✓
—
✓
✓
Customisable rules
6 rules
6 rules
—
100 rules
100 rules
Predicted datasets
✓
✓
—
✓
✓
Best for
Everyday flyersFull flight computer, WiFi sync & dual deploy in 18mm.
High-G launchesStronger outputs & superior IMU for bigger motors.
Competition & minimum dia.Lightest option for altitude records & first flights.
HPR & research200 Hz, 4 outputs, 256 MB — built for serious rocketry.
Remote launchesLive cellular telemetry & GPS from anywhere on Earth.
✓ Included
— Not available
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Upcoming product timeline
Mercury PLUS
ETA April 2026
Hardware finalised — firmware & testing in progress
Neptune V1
ETA Jul–Sep 2026
Hardware design complete — firmware development underway
Jupiter V1
ETA Jul–Oct 2026
Based on Neptune platform — cellular & GPS integration in progress
Sample real-world flight
View full flight data →
Apogee271.8m
7.6s
Speed ↑79.02 m/s
Speed ↓-9.58 m/s
Max acc0G
Stability78.10000
Views601
Flight selected at random from the top 10 highest-stability real flights over 220m. Browse all flights →
Mercury V1 - A small light flight computer and data logging altimeter
RRP: £56.99 $75.58 €65.99
GTIN: 5061078870020
MPN: MRS-MERCURYV1
Our Mercury altimeter has a range of highly accurate sensors and uploads flights hassle free over WiFi to the Altimeter Cloud website.
This device can be used as a simple turn it on and fly altimeter with tons of data that you can view afterwards, or as a small flight computer as well.
There are plenty of expansion modules and settings to manage plenty of advanced rocketry tasks. Our Action rules system lets you create actions when conditions are met from all the available data.
The Mercury V1 altimeter lets you view your altitude, velocity, acceleration axis, gyroscope data, tilt angles from vertical as well as pitch, roll and yaw, board temperature, predicted apogee, and even the air density as you fly.
With a MT1 expansion temperature sensor you can also add highly accurate air temperature readings to your logs.
Here is a recent sample flight flown on a Mercury that you can view Flight 1146 chart
The Mercury will fit in a 18mm tube (out of it's default case) and easilly in a 20-22mm tube in it's case. It weighs under 8 grams and has a 6 hour battery life in flight mode.
Whats more it has a internal battery and build in charger from it's USB-C port, so you don't have to worry about anything other than using it.
It is also really accurate! With the latest sensors you can have fun testing it measuring the height of your desk from the floor for example.
The Mercury works best with WiFi (Either home WiFi or a mobile hotspot via your phone), but you can also connect a SnapShot screen add on to view a summary of your last flight, or connect to it's internal WiFi server to view more information without any internet.
You can read lots more about the Mercury using the links below.
This device can be used as a simple turn it on and fly altimeter with tons of data that you can view afterwards, or as a small flight computer as well.
There are plenty of expansion modules and settings to manage plenty of advanced rocketry tasks. Our Action rules system lets you create actions when conditions are met from all the available data.
The Mercury V1 altimeter lets you view your altitude, velocity, acceleration axis, gyroscope data, tilt angles from vertical as well as pitch, roll and yaw, board temperature, predicted apogee, and even the air density as you fly.
With a MT1 expansion temperature sensor you can also add highly accurate air temperature readings to your logs.
Here is a recent sample flight flown on a Mercury that you can view Flight 1146 chart
The Mercury will fit in a 18mm tube (out of it's default case) and easilly in a 20-22mm tube in it's case. It weighs under 8 grams and has a 6 hour battery life in flight mode.
Whats more it has a internal battery and build in charger from it's USB-C port, so you don't have to worry about anything other than using it.
It is also really accurate! With the latest sensors you can have fun testing it measuring the height of your desk from the floor for example.
The Mercury works best with WiFi (Either home WiFi or a mobile hotspot via your phone), but you can also connect a SnapShot screen add on to view a summary of your last flight, or connect to it's internal WiFi server to view more information without any internet.
You can read lots more about the Mercury using the links below.
Where to buy
Manual / Full specifications
Nano V1 tiny 50Hz altimeter, just 1.35 grams 19mm x 10mm
RRP: £49.99 $66.3 €57.88
GTIN: 5061078870044
MPN: MRS-NANOV1
The Nano V1 altimeter is a really small altimeter.
It offers highly accurate pressure based altitude logging at a impressive 50 samples per second.
This altimeter weighs only 1.35 grams including it's onboard Lithium battery, there is also a battery charger built into the Nano. So when you plug it into a USB port it will charge itself and show up as a mass storage drive with all your flight logs.
You can upload your flight logs to the Altimeter Cloud from this USB drive, and the secure firmware also signs the logs. This means you can prove a flight log is genuine and undedited by uploading it to the verification tool on the Altimeter Cloud website.
So nobody can question your new altitude record!
The Nano has a 5 hour battery life in flight mode from a full charge, so you don't need to worry about it running out while waiting to launch either.
The onboard multi colour status LED gives you information about the configuration state, if it's ready to fly in flight mode and even when the battery is getting low as well.
If you have space you could consider our Mercury V1 altimeter as this is still pretty small and has additional sensors offering even more value. Or why not get both to cover all your plans and projects...
It offers highly accurate pressure based altitude logging at a impressive 50 samples per second.
This altimeter weighs only 1.35 grams including it's onboard Lithium battery, there is also a battery charger built into the Nano. So when you plug it into a USB port it will charge itself and show up as a mass storage drive with all your flight logs.
You can upload your flight logs to the Altimeter Cloud from this USB drive, and the secure firmware also signs the logs. This means you can prove a flight log is genuine and undedited by uploading it to the verification tool on the Altimeter Cloud website.
So nobody can question your new altitude record!
The Nano has a 5 hour battery life in flight mode from a full charge, so you don't need to worry about it running out while waiting to launch either.
The onboard multi colour status LED gives you information about the configuration state, if it's ready to fly in flight mode and even when the battery is getting low as well.
If you have space you could consider our Mercury V1 altimeter as this is still pretty small and has additional sensors offering even more value. Or why not get both to cover all your plans and projects...
Neptune V1 - A powerful flight computer
RRP: £99.99 $132.61 €115.78
GTIN: 5061078870150
MPN: MRS-NEPTUNEV1
In development: Prototypes have been verified, firmware is now in development. We are hoping to launch the Neptune in July to August 2026.
The Neptune V1 is our first high powered and exteremly well specified flight computer. It's still pretty small though, we've pictured it along side a 10 pence piece.
The Neptune has been designed to be plug and play with secure cable connectors, meaning you don't need to solder or get hugely involved in cables to use this flight computer. Your external battery can be connected via the onboard high quality XT30 battery plug.
Connector boards are connected to the Neptune via Molex Nano-Fit secure connectors. The 4x high current outputs are not your standard simple mosfet either, they are fully protected against over current and over temperature. They can also measure the exact resistance of your connected items so you can tell if there is an error before you fly. The current on each channel is also logged in the flight logs along with the resistance.
The Neptune also has 4 servo header pins included on the board so you can do plenty of advanced missions using the powerful rule building section of the Neptunes firmware.
Sensor wise the Neptune has a state of the art pressure sensor, a 3-axis 80G accelerometer, a second 3-axis 16G accelerometer, a 3-axis high quality magnetometer, a 3-axis 4000dgps gyroscope, a on board 0.1C accuracy temperature monitor and of course full monitoring of all outputs.
The Neptune has many other advanced features such as its built in LiPo battery that can be used to either power the board as primary or act in UPS mode using your external battery source first with the onboard battery as a backup to keep it running no matter what. There is a second tiny LTO battery and ultra precise real time clock so your flights will always have accurate time stamps.
The Neptune has a 256 MByte flight log storage memory which can be accessed via the MEM port on the front of the board should your Neptune be damaged. This will hopefully allow another Neptune to recover your flight data should there be a unexpected and unplanned accident.
Please feel free to drop us a email if you're interested in the Neptune so we can email you when they are ready.
The Neptune V1 is our first high powered and exteremly well specified flight computer. It's still pretty small though, we've pictured it along side a 10 pence piece.
The Neptune has been designed to be plug and play with secure cable connectors, meaning you don't need to solder or get hugely involved in cables to use this flight computer. Your external battery can be connected via the onboard high quality XT30 battery plug.
Connector boards are connected to the Neptune via Molex Nano-Fit secure connectors. The 4x high current outputs are not your standard simple mosfet either, they are fully protected against over current and over temperature. They can also measure the exact resistance of your connected items so you can tell if there is an error before you fly. The current on each channel is also logged in the flight logs along with the resistance.
The Neptune also has 4 servo header pins included on the board so you can do plenty of advanced missions using the powerful rule building section of the Neptunes firmware.
Sensor wise the Neptune has a state of the art pressure sensor, a 3-axis 80G accelerometer, a second 3-axis 16G accelerometer, a 3-axis high quality magnetometer, a 3-axis 4000dgps gyroscope, a on board 0.1C accuracy temperature monitor and of course full monitoring of all outputs.
The Neptune has many other advanced features such as its built in LiPo battery that can be used to either power the board as primary or act in UPS mode using your external battery source first with the onboard battery as a backup to keep it running no matter what. There is a second tiny LTO battery and ultra precise real time clock so your flights will always have accurate time stamps.
The Neptune has a 256 MByte flight log storage memory which can be accessed via the MEM port on the front of the board should your Neptune be damaged. This will hopefully allow another Neptune to recover your flight data should there be a unexpected and unplanned accident.
Please feel free to drop us a email if you're interested in the Neptune so we can email you when they are ready.