Buying guide
Sugar Thermometers: For Toffee, Fudge and Jam
Clip-on dial, glass or digital: choosing a sugar thermometer, plus the sugar stages and the temperatures that matter.
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Boiled sugar changes texture by the degree. A sugar thermometer clipped to the pan tells you exactly when toffee will snap, fudge will set or jam has reached its setting point.
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Types
| Type | Pros | Cons |
|---|---|---|
| Glass with a metal guard and clip | Classic, accurate, sugar stages marked | Fragile; slow to read |
| Dial | Easy to read | Check the probe reaches deep enough |
| Digital probe with clip | Fast and precise; often has alarms | Needs batteries; check the maximum temperature |
Sugar stages
| Stage | About | Used for |
|---|---|---|
| Soft to firm ball | 112–120°C | Fudge, Scottish tablet |
| Hard ball | 121–130°C | Nougat, marshmallows |
| Soft crack | 132–143°C | Butterscotch |
| Hard crack | 149–154°C | Toffee apples, yellowman |
What to check
- Range up to at least 200°C.
- A pan clip that holds the tip in the syrup without touching the base.
- Clear markings in °C.
Test it in boiling water first: it should read 100°C at sea level. Note any difference and adjust.
Frequently asked questions
How do I check a sugar thermometer is accurate?
Stand it in a pan of boiling water: at sea level it should read 100°C. If it reads 98°C, add 2°C to every target temperature.
Can I use a meat thermometer for sugar?
Only if its range goes high enough (at least 160°C) and it can stay in the pan. Many instant-read meat thermometers are not designed for boiling sugar.
Why does the thermometer tip need to stay off the bottom of the pan?
The base of the pan is hotter than the syrup, so touching it gives a falsely high reading.
Sources
- Candy making: stages of sugar cooking, Wikipedia. Checked 2 October 2026.
How we choose
BeneRecipes compares tools using manufacturer specifications and retailer listings. We have not tested these products ourselves and don't publish star ratings. We explain which type suits which cook and why.
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Recipes to go with it
Recipe · 3 hr
Scottish Tablet
Sugar, butter and condensed milk boiled and beaten until it sets firm and grainy: sweeter and crumblier than fudge.
Recipe · 1 hr 25 min
Yellowman
Northern Ireland's chewy-crisp honeycomb toffee, famously sold at the Ould Lammas Fair in Ballycastle.
Recipe · 45 min
Toffee Apples
Crisp apples on sticks, dipped in a glassy red toffee shell: the classic treat for Halloween and Bonfire Night.