Tempris, wireless sensor, allows placement of temperature sensors in any location within freeze-dryer. It is also a sensor of choice if product temperature of edge vials is monitored. Tempris sensor is not releasing heat while wired temperature sensors (thermocouples or data loggers) can transfer some heat into the product (very notable for the edge vials), obscuring the actual product temperature. It is especially very important if small fill volume is used when readings of thermocouples and data loggers from the edge vials produce uncertain temperature profiles.