Sprite Extruder Pro Kit 300℃ High Temperature Full Metal Thermistor

I have bought a Sprite Extruder Pro Kit 300℃ High Temperature Full Meta and built it on my home built printer…

it prints great but the temperature on the Nozzle does not fall completely to rest, fluctuates 2-3 degrees on either side of the set point…

I have not been able to find information about which type of Thermistor is on the Sprite Extruder…

if I look in the Marlin example files, no. 1 for thermistor is selected and I have read in several places that you must choose no. 61 to get up to 300ºC.??

I own an Ender 3 S1 Plus and it’s on loan so I can’t check if it does the same