LS-2900+ tissue microtome A Locking Hand Wheel. Sensor for self-diagnosis function. LS-2900+ tissue microtomeDesign Feature 1 ... shelf separate with environmentally safe refrigerant (R404). The chamber temperature can drop to working condition within 60 minutes after switching ... as sample travel, thickness, function control, day, time, temperature and time on/off.13.Stand by mode, after initialization ...