I use this kitchen gadget all of the time, whether I am taking the temperature of a beef tenderloin, turkey,  water before adding yeast to it and so on.

I have a Thermapen thermometer made by Owen Instruments.   It appears it is now made by ThermoWorks.  I have a plain, grey one and now they come in all kinds of colors.  The new version  is fully sealed to be absolutely splashproof.

This is a very good quality gadget and in a matter of seconds you get an accurate reading.  I have never been disappointed with the results and I have had mine a long time.  It is worth paying the extra money for this instant-read thermometer.

My water is perfect before adding yeast to it.  The water needs to be between 105°F and 115°F.