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Question about the Temperature Guard VM-5003HT Remote Temperature and Humidity Monitor

Answer: Within the unit are sensors for both temperature and humidity. The programming is not automatic: you do need a telephone line to initially program the upper and lower limits and another phone to call it. Everything is done via voice prompts. It is very easily programmed by following the voice instructions.

This remote environmental monitor, made in the USA, is truly inexpensive insurance against humidity and temperature damage. The VM-500-3HT combines the VM-300 which allows you to program upper and lower temperature limits with the ability to do the same with humdiity limits. Examples for Use: Florida second homes, computer rooms and green houses. The units has a 4 hour battery back-up enclosed within the unit and a one year manufacturer's warranty. Programmable temperature limits: 35° F to 125°. Humidity sensor measures within a sensing range of 0% and 90%RH. Programmable humidity limits:  0% to 99%:accuracy 5%. Remote dial-in access: check power, temperature, and humidity any time by entering your personal code.

Worls with answering machines: Connecting the Monitor to a Phone Line which has a fax or
answering machine connected to it. Program the monitor to answer after one more ring than the other device
on the line. This allows the other device to always answer first.
To call and access the monitor
1 Dial the phone number
2 Hang up one ring before the other device answers.
3 Wait no longer than 30 seconds, then dial the number again.
4 The monitor will answer.
Example: An answering or fax machine on the same line as the monitor
and is set to answer after 4 rings.
Program the monitor to answer after 5 rings.
To access the monitor, dial the number, let it ring three times, then
hang up. Wait 30 seconds and call again. After two rings, the monitor

The Temperature Guard monitors temperature and power wherever it is located, and dials the programmed emergency phone numbers you've entered if the temperature goes out of programmed limits or if the power goes out for more than five minutes.

Programming the Temperature Guard is accomplished using a telephone. Do this only once unless changes need to be made.

Before programming, do the following:

• Connect a phone line, plug in the power pack to an outlet, and connect the power jack. Use of a phone and power line surge suppressor is strongly recommended. 
• Turn the unit on by moving the power switch from the position labeled 0 to the position labeled
• From another phone line dial the number where the Temperature Guard is located. The Temperature Guard will pick up after the first ring. 
• The Temperature Guard prompts for the 4-digit PIN number. Enter the factory default PIN number, 0000 . 
• You will hear the Main Menu options. You may enter your selection at any time.

Programming Temperature Limits Model VM500
• 1.From the Main Menu, press 2 to Set Limits
• 2 You will hear the current low limit  (i.e. “Lower limit is 45°
• 3 You will hear “Press 1 to change temperature or Press 2 to change humidity
• 4 Press 1 to make a change or any other button to skip to step 8
• 5 You will hear “Enter number then press pound
• 6 Enter the temperature (Valid limits are 35° to 125° F), press #
• 7 You will hear the value you just entered (i.e. 55°
• 8 You will hear the current upper limit (i.e. “Upper limit is 85°

Programming Humidity Limits  Model VM500-3HT:
• From the Main Menu, press 2 to Set Limits 
• You will hear "Press 1 for temperature or 2 for humidity"
• Press 2 for humidity
• You will hear the current low limit  (i.e. “Lower limit is 0%
• You will hear “Press 1 to change” 6 Press 1 to make a change or any other button to skip to step 10
• You will hear “Enter number then press pound”8 Enter the value (Valid limits are 00% to 99% RH), then press #
• You will hear the value you just entered (i.e. 15%) 10 You will hear the current upper limit (i.e. “Upper limit is 85 %
• You will hear “Press 1 to change”
• Press 1 to make a change or press any other button to return to the Main Menu 

Temperature Guard VM-500-3 with Humidity Sensor Features:
• Dial out power alerts: Be notified if power failure lasts over five (5) minutes. Stops calling after power resumes or PIN entered.
• Dial- out temperature alerts : when temperature exceeds or is below limits you set.
• Dial-out humidity alerts: when humidity levels exceed or are below levels you set.
• Thermometer range: measures temperatures within a range of 32° F to 125° F. accuracy: 2°
• Programmable temperature limits: 35° F to 125°. Note: Limit is 3° F above freezing to avoid damage due to freezing temperatures Humidity sensor measures within a sensing range of 0% and 90%RH.
• Programmable humidity limits: 0% to 99%:accuracy 5%

Thank you for your question. Sincerely, Barbara