TOM Add-on Kit - Pump Version. Measures OTR, CTR and RQ in 4 shake flasks; Contains: TOM Sensor module - pump aeration 377x99x102(LxBxH), ambient pressure, 15-40°C, 30-85% rel. humidity, 0-16% CO2, 0-25% O2; connection cable 0.5m; 4 250mL TOM shake flasks included