The “series” and color codes are: Series 4 (blue tab) maintains a refrigerated temperature. Series 20M (black tab) maintains a frozen temperature. Series 22 (tan tab) maintains a room temperature.
No. Although it is recommended to have a thermometer to monitor the temperature and some filler material (newspaper, bubble-wrap, etc.) to prevent contents from shifting.
Yes, just not at the same time. Temperature controlling panels (the PCM System) can be purchased separately and swapped out depending on use.
Yes, if they have the same temperature parameters. No, if they require two different parameters.
Yes. The large cooler can be locked with a small, steel padlock. The small and medium coolers have double zippers that can be fastened together with a small, cable padlock.