The lantern of homecoming
This brass lantern, when lit from a flame, utilises the arcane connection between the two flames, and when the command word is uttered a small arrow suspended from the lantern will point to the original flame. If the flame is extinguished, the arcane connection will end and stop the magic working.
(InIg 1 "locate a fire" +4 Range: arcane connection +1 concentration for level 10, +5 levels for item maintains concentration for total level 15. Utilises the brass +3 Ignem shape/material bonus from HoH:MC, but you can also have the lantern having a hazel handle for +3 divination, and SG's discretion if a small arrow as a pointer counts for the +3 direction bonus from ArM5 p110)
The forge companion's aide
This hazel wand, inlaid with brass, when pointed at an item will make a number of its brass fittings glow, which the glow increasing with the item's hotness. It can be used from a safe distance to tell if a fire is hot enough to work metal, or if an item is already at annealing temperature, or even if water is close to boiling in the kitchen.
(InIg 2 "sense levels of heat" +3 range: sight, duration momentary, +10 levels unlimited uses for total level 15. Uses hazel +3 divination and brass +3 ignem. It's a thermometer that works at sight range)
The night watchman's aide
This brass amulet, when touched to a building and the user concentrates, will reveal where fires are lit. It is used to make sure that all fires that should be dampened are out and who has left candles burning. This only detects flames, so magical lightsources won't show up. Technically this counts as a scrying effect so a Verditius might complain that someone keeps scrying on his forge at night, but the covenant that built this turns a blind eye to trivial breaches of the Code that increase safety.
(InIg 2 "become aware of all fires within the target area" +1 range touch +1 duration concentration +3 target structure - total 15. As ever, brass +3 ignem is a handy bonus)