Models 08933-00 and -10 feature transparent acrylic walls for easy viewing of contents. Airtight doors need no lubrication. Desiccators provide dry, dust-free storage to 100°F (38°C); ideal for use in freezers, refrigerators, or at room temperature. What's included: two extra-deep sample trays and a desiccant tray. Models 08933-20 and -30 have all the features of the desiccators above plus a built-in thermohygrometer. Thermohygrometer has a temperature range of –58 to 158°F (–50 to 70°C) with a ±1.8°F accuracy up to 104°F and a humidity range of 20 to 95% with a ±5% accuracy. What's included: a thermohygrometer with LCD, two 1.5 V AAA alkaline batteries, two extra-deep sample trays, and a desiccant tray.