The Plant Sensor for your Home and Garden

Measures Vital Parameters

When plants are subjected to suboptimal growing conditions, they are under stress. This affects growth and survival. Therefore, Koubachi monitors limitations and excesses of the main vital factors. The Koubachi Plant Sensors measure soil moisture, sunlight, infrared light, ambient temperature and more to determine the vitality and exact needs of your plants.

Accurate Plant Care Advice

We don't just consider sensor measurements but also in-depth knowledge about each species, climate, season and user preferences. Unlike any other solution, Koubachi calculates an individual care plan for every single one of your plants. As a result Koubachi can provide you with highly specific care advice, and if necessary plant-saving alerts.

Weather Forecast Integration

Koubachi takes the weather into account. If there is a high probability of rain you will not be advised to water. You only receive a water notification if your plants are thirsty and no rain is imminent. Or if independent of the weather forecast your plants need water urgently.

Fully Rain Proof

Koubachi Wi-Fi Plant Sensor 2 Outdoor was designed to withstand low temperatures and heavy weather. It's fully rain proof and built garden-tough for year-round outdoor use. Of course you can use Plant Sensor 2 indoors as well.

Superior Soil Sensor

Our patented soil moisture sensor - like a tensiometer, the tool used by professionals - measures the soil moisture tension. It determines the quantity of water that is actually available to the plants' roots regardless of the soil type. Unlike cheaper methods (electrical conductivity, dielectric permittivity, capacitivity etc.) Koubachi measures with high accuracy, independent of soil conditions (e.g. content of ions). No calibration needed. Works in every soil substrate with unmatched precision.

Scientific Plant Care Models

Koubachi is able to precisely determine the needs of your plants. Our plant care models were developed with leading scientists of ETH Zurich and validated in numerous greenhouse experiments. For each species, we have determined the optimal values of all vital parameters and for each time of the year. Moreover, we have established the thresholds at which non-reversible damage will occur.

Free Pro Interface Trial

View interactive graphs for all measurements in your web browser. Features include data history access and raw data download. Compared to the full-blown pro interface (with Plant Sensor 2 Pro) this trial version does not allow the user to freely adjust measurement and transmission intervals, and values are shown in percentages only. Otherwise you get all Pro features for free.

Koubachi App

Notifications, advice and alarms are directly sent to you through push notifications or by e-mail. All your data, plants and settings are syn­chro­nized to the Koubachi cloud and thus always up-to-date on all devices. The app also helps you to identify your plants, or find additional in-depth information on hundreds of species. Available for iOS, Android or accessible via web browser.

Personalized Notifications

With your permission we will send you a message with detailed care instructions at the right time. These notifications are customizable and tailored to your preferences. Select about which parameters you wish to be informed. Choose how often and at what time you prefer to be notified. Decide whether you want to receive a push-notification, an e-mail or both.

Soil Temperature

Plant Sensor 2 Outdoor also measures soil temperature. This is important as soil temperature affects how quickly plants take up water and nutrients, which influences root development and plant growth. Soil temperature is also a very good indication of when to cover or bring container plants inside during cold seasons.


At Koubachi we are fully aware of the sensitivity of your data. Koubachi Plant Sensor 2 supports WEP, WPA and WPA2. In addition, every sensor gets its unique 128-bit AES key already during production. All communication between your sensor and the Koubachi system is securely encrypted at any time.


Koubachi Wi-Fi Plant Sensor 2 works with two standard AA batteries. The first set of batteries is already included and it's very easy to change batteries. Thanks to our Ultra-Low-Power radio technology we achieve never seen battery performance with Wi-Fi. The batteries last for at least one year.

Technical Specifications

Sensors & Measuring Range

  • Soil moisture: 0 to 10’000 hPA (0 to 100%)
  • Light intensity: 0 to 200'000 lux (300 - 1000 nm)
  • Ambient temperature: -20 °C to +55 °C
  • Soil temperature: -10 °C to +55 °C

Free User Interface

  • Koubachi iPhone App (App Store)
  • Koubachi Android App (Google Play)
  • Koubachi Web-Browser App (
  • Available in ENG, DEU, FRA, ITA, JAP


  • Maximal insertion force: 90 N (9 kg)
  • Operating temperature: 0 °C to 50 °C
  • Storage temperature: -10 °C to 60 °C

Wireless Connectivity

  • Wi-Fi: 802.11 b/g @ 2.4 GHz
  • Very low power consumption
  • AP/Ad-hoc mode


  • Device: 56 mm x 76 mm x 177 mm
  • Packaging: 73 mm x 82 mm x 195 mm
  • Weight: 200 g (incl. batteries)


  • RoHS conform
  • Free of lead (Pb), PVC, arsenic and mercury
  • Recyclable packaging


  • Security protocols: WEP, WPA, WPA2
  • AES encrypted server communication

Regulatory statements

  • CE Statement
  • FCC Statement


  • 2x 1.5 V batteries (AA)
  • Average battery lifetime: > 1 year

In the Box

  • Koubachi Wi-Fi Plant Sensor 2
  • 2x 1.5V batteries (AA)

Usage Tips

Sensor Tip

It is best not to touch the sensor tip as this might influence soil moisture measurements. If you feel the soil moisture sensor does not measure properly anymore, clean its tip with a little bit of pre-diluted dish liquid and a lot of water. Extra rinse with clean water. Do not use aggressive chemicals. Do not use substances containing oil or detergents containing lipid replenishers (moisturizers).

Please be Gentle

Avoid pushing the Koubachi Wi-Fi Plant Sensor into hard ground. If necessary loosen the soil with a dibble or spade.

One Sensor - Multiple Plants

Thanks to the self-learning sensor indoors you can use one sensor to take care of up to 27 plants across your home. In an outdoor environment conditions vary a lot. Distributed plants can underly a large variety of differing conditions (rain exposure, soil type, exposure to sun etc.). Therefore, currently we do not recommend to use the "Multi Plant" feature in the garden. A particularly tricky bit here is the learning phase of the sensor (before moving it to the next plant). We shall have a solution for this by spring 2015.

Burry the Sensor Spike

Gently insert the sensor stake into the ground as deep as possible. Place the sensor tip near to the root ball. Ideally, only the round sensor head will peek out of the ground.

Visibility of Measurements in the App

In the Koubachi App for each of your plants you can access a Care View (green-icon with leaf). Like a control panel, this view shows you the levels of all vital parameters (water, misting, fertilizer, temperature, light). Please note that it takes some time, until changes (e.g. after watering) are confirmed and represented in this view. If you would like to see an update of current measurements, just briefly press the button on the sensor and up-to-date measurements will be shown within seconds in the Sensor View (grey sensor icon).

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