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The EL-GFX-DTP-PROBE-G is a vaccination monitoring kit combining a USB dual channel data logger with two glycol bottle probes. The unit stores over 250,000 readings, has an on-screen display showing max, min and last log as well as an on-board graph of the data collected. Buttons allow the user to start, stop and restart the logger in the field and alarm breaches can be registered with both LED and audible alarms. The logger can be battery powered or used with a USB wall adapter. Two channels allow measurement of two areas of a refrigerator or a refrigerator and freezer at the same time.