Animal Rectal Probes for fast intermittent measurements. Smooth ball tip. Stainless steel shaft. Smooth ball tip, 1" long stainless steel shaft, .059" dia. .125" tip diameter, 5' lead length. Time constant .8 secs. The RET-4 Rectal probe for very small animals (neonatal mice). Flexible polyurethane sheath with smooth rounded tip (see inset). 36" long (can be made longer). Outside diameter nominal 0.032" (max at tip 0.04"). Time constant 0.18 seconds. Max temp. 140 degrees C. May be sterilized by Gas (ETO), Gluteraldehyde solution or autoclave.