just curious on the herpstat intro+:

i have ultratherm heat mats from Reptile Basics and with my Jump Start thermostats i'm having a hard time having steady regulation. i know there's a 2° delta but the actual temp isn't +-2°, almost like +-3 or +-4. it's not terrible but it is worrisome.
i bought the herpstat intro+ (not here yet) to try and rectify this so i'm looking for any insight into ultratherm mats or the herpstat intro+ on their own. i have a glass tank and a T8 so they handle heat a bit differently: on the glass tank i used to have a Zoomed adhesive UTH but i wasn't a fan. any insight into the Ultratherm or Herpstat intro+ would be much appreciated.