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Gravity: Lab Grade Analog pH Sensor Kit (With Calibration Solutions)

SKU: DF-SEN0161-V2
Sale price 48,95 €
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📦 From 50€ in Germany, 100€ in the EU, 45€ in the US!
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Guarantee & Return Policy

Effective Date: December 10, 2025

At OpenELAB, we are committed to providing accurate product descriptions and high-quality electronics. The following policy outlines your rights and obligations, designed to be fair to both our customers and our business operations globally.

1. Warranty Policy

A. Standard Limited Warranty (Global & US)

For customers in the United States, Asia, and other non-EU regions:

  • Warranty Period: OpenELAB provides a 12-month warranty from the date of delivery.

  • Coverage: This warranty covers defects in material and workmanship under normal use.

  • Resolution: We will repair or replace defective units at no charge.

B. Statutory Rights for EU/UK Customers (EU Compliance)

If you are a consumer residing in the European Union or the UK purchasing from our global site:

  • Statutory Guarantee: You are entitled to a 24-month statutory guarantee for conformity defects present at the time of delivery, in accordance with EU consumer protection laws.

  • Relation: The Standard Limited Warranty (Section 1.A) applies in addition to, and does not replace, your statutory rights.

C. Warranty Exclusions (Applies to ALL Regions)

Warranty coverage is VOID if the damage is caused by:

  1. Misuse: Incorrect installation, reverse polarity, or exceeding voltage limits.

  2. Unauthorized Modification: This explicitly includes soldering, cutting pins, modifying the PCB, or flashing unauthorized/beta firmware that "bricks" the device.

  3. Physical Damage: Drops, moisture/water damage, or electrical surges (lightning).

  4. Normal Wear & Tear: Consumable parts (e.g., batteries), unless defective upon arrival.

Note: For non-warranty repairs (e.g., customer-induced damage), we may offer repair services for a fee. Shipping and diagnostic costs will be borne by the customer.

2. Return & Refund Policy

A. Return Window

  • Standard: You may request a return within 31 days of receiving your order.

B. Refund Conditions & Restocking Fees

To protect against policy abuse, the refund amount is strictly determined by the condition of the returned item.

1. Full Refund (100%)

  • The item is Brand New, Unopened, and Unused.

  • The original packaging is intact and sealed.

  • All accessories are present.

2. Partial Refund (Restocking Fee / Value Depreciation)
If the item is returned in a condition that prevents it from being sold as new, OpenELAB reserves the right to deduct a Restocking Fee (for US/Global) or Compensation for Loss of Value (for EU) from the refund amount.
Deductions apply if:

  • Signs of Use: Visible scratches, mounting marks on screw holes, or fingerprints.

  • Damaged Packaging: Original box is torn, written on, or missing.

  • Technical Modification: The device has been soldered, permanently installed, or flashed with unauthorized firmware.

  • Broken Seals: Anti-static bags or security seals have been opened.

Depending on the severity of the usage/damage, the deduction may range from 15% to 50% of the product price. Items damaged beyond repair due to misuse will not be refunded.

C. Shipping Costs

  • Defective / Wrong Item: OpenELAB covers the return shipping cost.

  • Customer Remorse (Changed Mind / Ordered Wrong Item): The customer is responsible for all return shipping costs to our designated return center (located in the US, Germany, or China, depending on your region). Original shipping fees are non-refundable unless required by local law.

3. Return Process (RMA)

To ensure a smooth return process, please follow these steps:

  1. Authorization: Contact us at info@openelab.io before returning any item. Returns without prior authorization will not be accepted.

  2. RMA Number: We will provide you with a Return Merchandise Authorization (RMA) number and the correct return address.

  3. Packing: Ship the item back in its original packaging with the RMA number clearly marked on the shipping label (not on the product box).

  4. Tracking: We strongly recommend using a trackable shipping method. OpenELAB is not responsible for returns lost in transit.
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Gravity: Lab Grade Analog pH Sensor Kit (With Calibration Solutions)-1

Gravity: Lab Grade Analog pH Sensor Kit (With Calibration Solutions)

48,95 €

The Gravity: Lab Grade Analog pH Sensor Kit (SEN0161‑V2) is a high‑precision pH sensor designed for liquid analysis, accurately measuring acidity and alkalinity. Widely used in aquaponics, aquaculture, environmental monitoring, and water quality testing, this sensor provides reliable data for both hobbyists and professionals.

Compared to V1, the upgraded SEN0161‑V2 delivers improved accuracy and a smoother user experience. Its onboard voltage regulator supports a wide input range of 3.3V to 5.5V, ensuring compatibility with Arduino and other 3.3V/5V microcontrollers. The hardware‑filtered output signal minimizes noise and ensures stable, low‑jitter readings. With the included Arduino library, users benefit from two‑point calibration and automatic detection of standard buffer solutions (pH 4.0 and pH 7.0), making setup simple, reliable, and efficient.

This makes the Gravity SEN0161‑V2 pH Sensor Kit the ideal choice for IoT water quality monitoring, smart farming, and scientific research applications.

 

Projects

Project 1. Calibrating an Analog pH Sensor (with Linear Algebra)

Introduction: This video is an overview and tutorial for an analog pH sensor that's compatible with both Arduino and Raspberry Pi. It will also give a general overview of linear functions and interpolation. Plus it will show you how to write a custom code to use this sensor on an unsupported platform (Espruino).


Project 2. How to use DFRobot pH Meter module with an ESP32


Project 3. How to measure and indicate the pH of liquids with Arduino and LCD

Introduction: This video will show how to measure the pH of common liquids in our home in an easy and comfortable way perfect for monitoring the pH of fish, chemicals, etc.


Project 4. pH Sensor: Assembling, Coding, & Calibrating with Arduino | Smart Gardening

Introduction: This video talks about what pH sensors are, why use them for aquaponics system, and how to assemble, code, and calibrate the Gravity: Analog pH Sensor (Version 2).


Project 5. How to use pH meter V2 in ESP32 with new calibration

Introduction: This tutorial will teach you how to program with esp32 and how to do calibration with arduino IDE, how to use ph meter v2 in esp32 with new calibration.


Features

  • Wide voltage input (3.3~5.5V), compatible with both 3.3V and 5V boards

  • Low-jitter output signal thanks to hardware filtering

  • Gravity interface and BNC connector for easy, plug-and-play setup

  • Two-point calibration via software library with auto buffer recognition

  • Uniform sensor size and connector for easier system integration

 

Applications

  • Aquaponics and hydroponics systems

  • Aquaculture water quality monitoring

  • Laboratory chemical testing

  • Environmental water sampling

  • DIY multi-parameter water testing kits

 

Technical Specifications

Signal Conversion Board (Transmitter V2)

  • Supply Voltage: 3.3~5.5V

  • Output Voltage: 0~3.0V

  • Probe Connector: BNC

  • Signal Connector: PH2.0-3P

  • Measurement Accuracy: ±0.1 @ 25℃

  • Board Dimensions: 42mm × 32mm (1.66 × 1.26 in)

pH Probe (Lab Grade)

  • Detection Range: 0 ~ 14 pH

  • Zero Point: 7 ± 0.5

  • Temperature Range: 5 ~ 60°C

  • Response Time: < 2 minutes

  • Internal Resistance: < 250MΩ

  • Probe Life: > 0.5 years (depends on usage)

  • Cable Length: 100cm

 

Package Contents

  • 1x Lab Grade pH Probe

  • 1x pH Signal Conversion Board (Transmitter V2)

  • 1x Gravity Analog Sensor Cable

  • 2x pH Standard Buffer Solution 4.0

  • 2x pH Standard Buffer Solution 7.0

  • 2x Waterproof Gasket

  • 1x Screw Cap for BNC Connector

  • 4x M3 × 10 Nylon Pillar

  • 8x M3 × 5 Screws

Gravity: Lab Grade Analog pH Sensor Kit (With Calibration Solutions)-2

 

Important Notes

  • Keep the BNC connector and signal board dry and clean to avoid measurement errors.

  • Avoid placing the board on wet surfaces; use nylon pillars for mounting.

  • The glass bulb at the probe tip is delicate — handle with care to prevent damage.

  • Do not leave the probe connected to the board without power for long periods.

  • Crystals forming around the protective cap are normal and do not affect accuracy. Return them to the cap if possible.

 

FAQ

How often does the pH probe need to be calibrated?

The calibration interval depends on the frequency of use. In general, calibration can be performed once a month. For frequent usage, it is recommended to calibrate the probe once a week. Always use fresh standard buffer solution during calibration to ensure accuracy.

Is two‑point calibration necessary, or can I perform only one‑point calibration?

For low‑demand applications, a single‑point calibration using a neutral buffer solution (pH 7.0) can be performed to confirm the zero point of the probe. In this case, the slope is assumed to be the theoretical value. However, to verify the actual slope, calibration with a pH 4.0 buffer solution should follow. Therefore, to achieve higher measurement accuracy, two‑point calibration is strongly recommended.

1. General Shipping Information

  • We provide premium shipping methods with a tracking number for each order.
  • Shipping addresses must be entered in English without special symbols to help the courier company recognize your address in the system. We will ship strictly according to the shipping address you provided. Please notify us of any address change before your order is marked "Shipped" to avoid parcel loss.
  • Please contact our customer service staff immediately if you need to cancel or change an order. Once your order has reached "Shipped" status, it can no longer be canceled or changed in any way. To avoid complications, please recheck your shopping cart before checkout.
  • We can ship all in-stock orders within 1 business day after your order has been confirmed.
  • All items are inspected before dispatch and are carefully hand-packed.
  • With standard courier practice, you need to check the contents of the parcel before signing for your goods. Otherwise, we will not be held responsible for any damage that may have occurred in transit.

🚀 Need Faster Shipping?

If you require expedited shipping (Express), please contact our customer support team at info@openelab.io for a customized quote tailored to your location.

2. Shipping Rates & Options

Our shipping rates are calculated based on the order value and destination. Please refer to the tables below for details.

2.1 Germany (Domestic)

Shipping Method Order Value Cost Est. Delivery
Deutsche Post €0 - €50.00 €4.95 2-4 Business Days
Deutsche Post Over €50.00 Free 2-4 Business Days
DHL Paket
(Faster Delivery)		 €0 - €50.00 €6.95 1-3 Business Days
DHL Paket
(Faster Delivery)		 €50.00 - €100.00 €2.00 1-3 Business Days
DHL Paket
(Faster Delivery)		 Over €100.00 Free 1-3 Business Days

2.2 European Union (EU)*

*Including:

Åland Islands, Andorra, Austria, Belgium, Bosnia & Herzegovina, Bulgaria, Croatia, Czechia, Denmark, Estonia, Faroe Islands, Finland, France, Gibraltar, Greece, Guernsey, Hungary, Ireland, Isle of Man, Italy, Jersey, Latvia, Lithuania, Luxembourg, Malta, Moldova, Monaco, Montenegro, Netherlands, North Macedonia, Poland, Portugal, Romania, San Marino, Serbia, Slovakia, Slovenia, Spain, Svalbard & Jan Mayen, Sweden.*
Shipping Method Order Value Cost Est. Delivery
Deutsche Post €0 - €100.00 €7.95 5-9 Business Days
Deutsche Post Over €100.00 Free 5-9 Business Days
DHL Paket
(Faster Delivery)		 €0 - €100.00 €15.95 3-7 Business Days
DHL Paket
(Faster Delivery)		 €100.00 - €250.00 €7.95 3-7 Business Days
DHL Paket
(Faster Delivery)		 Over €250.00 Free 3-7 Business Days

2.3 United States

Region Shipping Method Order Value Cost Est. Delivery
Continental U.S.
(50 States)		 USPS Ground Advantage €0 - €45.00 €5.95 3-7 Business Days
USPS Ground Advantage Over €45.00 Free 3-7 Business Days
USPS Priority Mail €0 - €45.00 €16.95 1-4 Business Days
USPS Priority Mail Over €45.00 €14.95 1-4 Business Days
Non-Continental U.S.
(AK, HI, PR, etc.)		 USPS Ground Advantage €0 - €60.00 €6.95 5-9 Business Days
USPS Ground Advantage Over €60.00 Free 5-9 Business Days

* The regions in the Non-Continental U.S. include: Alaska, American Samoa, Guam, Hawaii, the Marshall Islands, the Northern Mariana Islands, Palau, Puerto Rico, the U.S. Virgin Islands, and all U.S. Armed Forces addresses. The shipping and delivery to these areas are subject to the Non-Continental U.S. shipping rules.

2.4 International (Outside EU)

For specific international destinations, including Switzerland, United Kingdom, and Norway.

Order Amount Shipping Cost
€0 - €300.00 €19.95
Over €300.00 Free

Important Notice:

  • Inventory Status: Please check the inventory status on the product page. Our system displays real-time stock for our Munich and Long Beach warehouses. If an item is out of stock in these locations, it will be marked as "Pre-order". You can still place an order for these items.
  • Pre-order Fulfillment: For "Pre-order" items, we arrange the most efficient logistics solution to ensure you receive your goods as quickly as possible. Your package may be shipped directly from our Shenzhen warehouse. Alternatively, as part of our standard restocking process, we may transport the goods to our Munich or Long Beach warehouse first (typically taking 5-10 business days) before dispatching them to you.
  • Split Shipments: If your order contains both in-stock and Pre-order items, we will prioritize shipping the in-stock items from the local warehouse immediately. The remaining Pre-order items will be sent to you in a separate shipment once they are ready.

3. International Warehouse

Our products are stored in our Munich, Long Beach, and Shenzhen warehouses to provide more flexible logistics solutions tailored to different regions and customer needs. On each product's description page, we indicate the specific warehouse location to help you better plan your purchase and delivery schedule.

3.1 German Warehouse

For products stored in our warehouse in Munich, we use either Deutsche Post or DHL for shipping, depending on the size of the package. Logistics within Germany are very efficient, with an estimated delivery time of 2-4 business days, ensuring you receive your order quickly and conveniently. For Western EU countries, the estimated delivery time is 4-6 business days. For Eastern EU countries, the estimated delivery time is 6-8 business days.

3.2 US Warehouse

For products stored in our warehouse in Long Beach, we use either USPS or UPS for shipping, depending on the size of the package. Logistics within U.S. are very efficient, with an estimated delivery time of 3-7 business days, ensuring you receive your order quickly and conveniently.

3.3 Chinese Warehouse

For Pre-order items or orders fulfilled directly from our Shenzhen warehouse, we utilize YunExpress for reliable international shipping. Given the complexities of international shipping, the estimated delivery time for these packages is around 10 business days, though this may vary slightly due to customs processes or other uncontrollable factors. Otherwise, products will be restocked to our Munich or US warehouses before final delivery, as detailed in the "Important Notice" above.

4. Customs and Taxes

4.1 How are customs handled by OpenELAB for import or export?

For EU Member States: Whether shipped from Germany or China, we cover all import duties and taxes (DDP), ensuring that you receive your package without any additional costs or hassle with customs.

Important Exception for Non-EU Countries (e.g., Switzerland, Norway):
For countries outside of the European Union, such as Switzerland and Norway, you may be subject to import duties, taxes, and/or customs fees charged upon delivery. These fees vary from country to country and are the sole responsibility of the recipient.

⚠️ Refusal of Delivery: If you refuse to pay these fees upon delivery and the package is returned to us, the refund amount will be calculated after deducting the original shipping costs, return shipping costs, and any applicable customs or storage fees.

4.2 How is VAT charged when the Customer places an order from OpenELAB?

In accordance with the newest VAT e-commerce rules in the EU, OpenELAB shall have the right to charge the amount of VAT at checkout. The standard rate of actual VAT applied is subject to the destination country's regulations. No additional VAT will be charged upon delivery for these orders.