MiniVent Ventilator is ideal for mice, but may also be used for peri-natal rats. Respiration rate is adjustable from 60 to 400 strokes per minute and tidal volume is adjustable from 30 to 350 microliters. The palm-sized unit takes up little space. The MiniVent is a constant-volume respiration pump with a rotary plunger; there are no valves to clog. Harvard Apparatus, Inc.800-272-2775www.harvardapparatus.com