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Thank you for viewing our M307 Wifi netGuard.  This model has been replaced by the M309 NetGuard.

Our low cost NetGuards are the latest addition to the Temperature Guard product line.

The NetGuards are designed to simply and easily monitor a refrigerator/freezer storing temperature sensitive drugs and samples.

Absolutely no ongoing fees!

Communicates on your existing Wifi network.


Designed to Meet All VFC Requirements

M307 Wifi NetGuard

  • Monitor two temperatures from -328°F to 392°F

  • Optional built-in ambient temperature and humidity sensor

  • Calibrated measuring range: -148°F to 78°F with +- 1°F accuracy

  • Communicates over Wifi. An Ethernet version available
  • Available with A2LA or NIST certificate

  • Displays current, Min, Max temperature readings

  • Internal alarm buzzer (85dB) actively notifies out-of-range temperatures

  • Low battery indicator

  • 4000 readings memory storage

  • User programmable logging interval

  • Comes with free software to download log file, send alarm emails/text messages



The M307 monitors two temperature sensors, perfect for a refrigerator/freezer combo, two door inputs.

The M307 operates on your Wifi network to communicate with our Data Capture software.

The M307 runs for up to 6 hours without power on its internal rechargeable batteries, continuously logging data in its internal memory.


Stores up to a 5 months worth of data in it's internal memory which is accessed via our Data Capture software.

Stores 180 days of daily Hi-Lo temperature data for each sensor.

Our free, PC based Data Capture software, simplifies your temperature logging tasks by automatically recording the temperature status of all of your M307 units across your entire network.


Data Capture sends out alarm emails and text messages when a sensor goes out of limits.


  • Built-in 802.11 b/g/n

  • Onboard 4000 reading data storage

  • Local audible alarm

  • Solid state relay output for connection to existing security system

  • Programmable high and low temperature limits for each sensor

  • Programmable alarm time delay for each refrigerator/freezer

  • Data logging capabilities

  • Security

IEEE 802.11i - PSK with AES-CCMP Encryption 
TKIP Encryption 
64/128-bit WEP


  • Maximum temperature sensor range: -328°F to 392°F, -200°C to 200°C

  • Factory calibrated range -148°F to 78°F (-100°C to 21°C) to better than 1°F degree

  • Field calibration can be performed at one point

  • Measurement resolution 0.1°

  • Sensor Type: 1000 Ohm Platinum (.00385 TCR)

  • Number of Temperature Inputs: 2

  • Number of Door Sensor Inputs: 2

  • Internal Memory:  4000 records

  • Internal Memory Data Update Rate: Programmable 1 to 60 minutes

  • Network Interface: 802.11 b/g/n

  • Internal alarm buzzer

  • Rechargeable battery backup included keeps the M307 operating for up to 2 days.

  • Internationally compatible plug-in wall transformer included (100-240v 50-60hz) Standard US plug.

  • Operating Temperature Range 32°F to 125°F

  • Enclosure Dimensions: 5.625" x 3.250" x 1.375"


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