Morso says in the manual:
To help gauge the correct running temperature of your stove, we recommend you use the Morsø
Flue Gas Thermometer (part # 62901200). The Flue Gas Thermometer magnetically attaches
onto the stove pipe approx 20 cm (8”) above the stove’s top plate and measures the surface
temperature of the stove pipe.
This is a surface mount, magnetic thermometer for single-wall stove pipe. It does not pertain to double-wall stove pipe which needs a probe thermometer for an accurate reading of the flue gas temperature. Follow the instructions for the probe thermometer if installing it in double-wall stove pipe.
(broken link removed to https://www.stovespareparts.com/online-shop/stove-accessories/stove-essentials/morso-magnetic-stove-flue-pipe-thermometer)
To help gauge the correct running temperature of your stove, we recommend you use the Morsø
Flue Gas Thermometer (part # 62901200). The Flue Gas Thermometer magnetically attaches
onto the stove pipe approx 20 cm (8”) above the stove’s top plate and measures the surface
temperature of the stove pipe.
This is a surface mount, magnetic thermometer for single-wall stove pipe. It does not pertain to double-wall stove pipe which needs a probe thermometer for an accurate reading of the flue gas temperature. Follow the instructions for the probe thermometer if installing it in double-wall stove pipe.
(broken link removed to https://www.stovespareparts.com/online-shop/stove-accessories/stove-essentials/morso-magnetic-stove-flue-pipe-thermometer)