thermometer

I have two inkbirds and they have a 4 degree difference so I need a thermometer to calibrate them. Does anyone use a candy thermometer to check there tank? Or should I buy the Hanna thermometer since those seem highly recommended?

Hi yall, I literally just started a new salt water 20 gal tank today and I had one of the top fin glass thermometers inside. I went to move it but my dumb mistake was I squeezed it from the top and the glass broke into my finger tips. I believe all the glass stayed on my finger tips I...