any cooking thermometer will work, including a meat thermometer. If you do not have one at all, you can use this cold water method to approximate the candy temp: https://www.thespruceeats.com/making-candy-without-a-candy-thermometer-520309. Allulose will burn above 300F, so it is important not to go above that temperature.
is the candy thermometer a must?? I don't have one
any cooking thermometer will work, including a meat thermometer. If you do not have one at all, you can use this cold water method to approximate the candy temp: https://www.thespruceeats.com/making-candy-without-a-candy-thermometer-520309. Allulose will burn above 300F, so it is important not to go above that temperature.