# Inkbird ITC308Wifi - 2 different sized sensors - why and which is best

**URL:** <https://community.inkbird.com/t/inkbird-itc308wifi-2-different-sized-sensors-why-and-which-is-best/143>\
**Category:** Uncategorized\
**Created:** [November 11, 2021, 9:00am UTC](https://community.inkbird.com/t/inkbird-itc308wifi-2-different-sized-sensors-why-and-which-is-best/143 "2021-11-11T09:00:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![graybale65](https://avatars.discourse-cdn.com/v4/letter/g/cab0a1/32.png) [@graybale65](https://community.inkbird.com/u/graybale65)\
**Post date:** [November 11, 2021, 9:00am UTC](https://community.inkbird.com/t/inkbird-itc308wifi-2-different-sized-sensors-why-and-which-is-best/143/1 "2021-11-11T09:00:12Z")

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Inkbird ITC308Wifi - 2 different sized sensors - why and which is best

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**Author:** ![Tania](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/tania/32/88_2.png) [@Tania](https://community.inkbird.com/u/Tania)\
**Post date:** [November 15, 2021, 4:17am UTC](https://community.inkbird.com/t/inkbird-itc308wifi-2-different-sized-sensors-why-and-which-is-best/143/2 "2021-11-15T04:17:25Z")

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Hello,  
It depends on your needs.  
Metal probe and plastic probe are IP68 waterproof.  
The metal probe is stainless steel food grade, it can directly contact food.  
The plastic probe is fully covered by plastic, which is more suitable for aquatic environment. It is not food grade. Therefore, we do not recommend that it directly contact food.