The sensor lance is a rugged spear used to monitor the temperature of grain in piles, flat storage warehouses, or is easily portable to any location where temperature readings are needed. Digital sensors are encased in a flexible fiberglass rod that has a super smooth surface for easy insertion into the grain. The lance has a rugged handle with a substantial grip for ease of use. The lance connects to a portable handheld reader where readings can be viewed for up to 20 lances. Temperature data can be transferred to a PC where Crop-Protector™ Manager software can generate historical trend reports for each sensor.