Esophageal/Rectal Probe for larger animals. Flexible vinyl covered, soft tipped. 5 foot lead (can be made longer), 7/32'' max. tip diameter, lead diameter 1/8''. Time constant 5.0 seconds. Time Constant is defined as the time required to reach 63% of final temperature in liquid. An accurate reading is obtained when the reading stops changing, typically 5-10 time constants. Maximum Temperature refers to intermittent use of probe. When probe is used for continuous measurements, maximum temperature should be reduced by 25% unless specified.