4-point display type With adhesive Primary color: pale yellow Color after discoloration: black Discoloration temperature (℃): 140/150/160/170 Measurement method: irreversible Measurement accuracy: ±4°C Element size (mm): 2 Element size (φmm): 2 密封尺寸(mm):8×20 床单尺寸(mm):8×20 床单尺寸(mm):8×20