Are Soil Moisture Sensor Meters in any way toxic?

[Magnes]

Hi. I was using this Soil Moisture Sensor Meter that comes without battery (picture below) and its end broke off inside the ground so I had to throw the meter away and get a new one. My question is are there any toxic materials inside it that can damage the plant or is it totally okay to just leave the broken part inside the pot?

Couldn't find any information on that question online so had to ask.

 

[headfullofbees]

No
There is a natural potential difference between two metals; say copper & zinc, which is why they often have two probes, & is why they do not need batteries. (The one you show still has two detectors but they are both within the same probe.)
The amount of moisture in the soil will change the conductivity of that potential difference, & that is what shows on the meter.
Won't be more harmful than dropping a penny into the soil.

Welcome to the forum.