Introducing lockable ICRplus Settle Plates for viable air monitoring and personnel monitoring in clean rooms and isolators. The new plates are based on the original ICR Settle Plate technology and provide semi-quantitative determination of microbial contamination. The plates feature a new two-way closure system: the "CLOSED" position allows safe transportation and aerobic incubation while the "VENT" position expands incubation for the detection of anaerobic and microaerophilic microorganisms. They are produced under aseptic conditions, gamma-irradiated and triple-bagged, making them suitable for personnel monitoring, passive air sampling and active air sampling with sieve like samplers in isolators and clean rooms. The plates are offered in formulations with neutralizers for the inactivation of disinfectant. Additionally, the plates can be utilized for the detection of fastidious bacteria when used in combination with Chocolate Agar and lecithin, Tween 80 and histidine (LTH).