# Need more information on ph sensors **URL:** \ **Category:** Sensors\ **Created:** [November 27, 2020, 12:28pm UTC](https://forum.arduino.cc/t/need-more-information-on-ph-sensors/684560 "2020-11-27T12:28:42Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![AnuragGupta](https://avatars.discourse-cdn.com/v4/letter/a/5daacb/32.png) [@AnuragGupta](https://forum.arduino.cc/u/AnuragGupta)\ **Post date:** [November 27, 2020, 12:28pm UTC](https://forum.arduino.cc/t/need-more-information-on-ph-sensors/684560/1 "2020-11-27T12:28:42Z")
Hi guys I want to measure the ph of the soil although the product Gravity: Analog pH Sensor / Meter Kit For Arduino: > **[Gravity: Analog pH Sensor / Meter Kit for Arduino | DFRobot Electronics](https://www.dfrobot.com/product-1025.html)** > > This analog ph meter for arduino is designed for water quality monitoring. It can get pH measurements at ± 0.1pH (25 ℃). For most hobbyists, this great accuracy range and its low cost make this a great tool for biorobotics and other environment... is for aqueous solution.Also Analog Spear Tip pH Sensor / Meter Kit: > **[Gravity: Analog Spear Tip pH Sensor / Meter Kit | DFRobot Electronics](https://www.dfrobot.com/product-1668.html)** > > DFRobot Gravity: Analog Spear Tip pH Sensor is specifically designed to measure the pH of the solution and reflect the acidity or alkalinity. DFRobot offers PH meter Sensor wide inventory, datasheets & technical support. says it can be used for semi solid but very costly. I was curious about if there is any other cheaper alternative to measure ph . I also found this : [https://www.electronicscomp.com/3-way-s ... bUQAvD\_BwE](https://www.electronicscomp.com/3-way-soil-meter-for-moisture,-light-intensity-and-ph-testing-meter?gclid=CjwKCAiAnvj9BRA4EiwAuUMDf7F-4yAVd9-8gDIbUCaGVRlhuCTDQIsjuhQ0UVbWnNoZIOr1zH82fhoC1bUQAvD_BwE) How ths device is measuring ph at such low price ,is it reliable/accurate?Please guide. Thanks ---
**Author:** ![Koepel](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/koepel/32/637546_2.png) [@Koepel](https://forum.arduino.cc/u/Koepel)\ **Post date:** [November 27, 2020, 7:21pm UTC](https://forum.arduino.cc/t/need-more-information-on-ph-sensors/684560/2 "2020-11-27T19:21:25Z")
Translation: > Hi guys, > > I want to measure the PH of the soil although the product is for aqueous solution: [Analog pH Sensor / Meter Kit For Arduino](https://www.dfrobot.com/product-1025.html) > > Also [Analog Spear Tip pH Sensor / Meter Kit](https://www.dfrobot.com/product-1668.html) says it can be used for semi solid but it is very costly. > > I was curious about if there is any other cheaper alternative to measure PH. > > I also found this: [3 Way Soil Meter](https://www.electronicscomp.com/3-way-soil-meter-for-moisture,-light-intensity-and-ph-testing-meter). How this device is measuring PH at such low price, is it reliable/accurate? Please guide. > > Thanks ---
**Author:** ![MarkT](https://avatars.discourse-cdn.com/v4/letter/m/c89c15/32.png) [@MarkT](https://forum.arduino.cc/u/MarkT)\ **Post date:** [November 28, 2020, 5:43pm UTC](https://forum.arduino.cc/t/need-more-information-on-ph-sensors/684560/3 "2020-11-28T17:43:38Z")
pH probes are by nature very delicate, so its a difficult problem to make a robust enough probe - if you want cheap, I think you have to buy litmus paper and do it by hand. That 3-way tester doesn't have a pH sensor, so it can't measure pH. It uses different metals in the probes in an attempt to measure electrochemical potentials, so its likely measuring a proxy for pH, not pH itself. ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [May 6, 2021, 10:31am UTC](https://forum.arduino.cc/t/need-more-information-on-ph-sensors/684560/4 "2021-05-06T10:31:07Z")
Closed on May 6, 2021, 10:31am UTC