RET-4 -The new 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°C. May be sterilized by Gas (ETO), Gluteraldehyde solution or autoclave.