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Alys Fowler writes in The Guardian "a soil thermometer is a worthwhile investment. The general room is that the soil needs to be 8-10°C consistently for a week or so to get growth going."

This soil probe thermometer has a temperature range of 0 to 80°C in 1°C increments.

The thermometer has a strong plastic body with a pointed tip, measuring approx. 12˝" (32mm).