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Er.3 means the unit is sensing the ambient temperature (i.e., room temperature) is below or above the specified range needed for the unit to operate. If the unit has been inside at normal room temperatures, it probably means the unit is defective or otherwise broken. You can attend to reset by removing the batteries for at least two minutes then reinserting before attempting to use again. Repeated "Er.3" messages mean the unit is now garbage.
Go to http://www.safety1st.com/usa/eng/Products/Child-Care/Thermometers/?start=0 and find your thermometer. Click on the picture, towards the bottom there is a section you can click on called instructions. Then it will bring up a new menu it will ask you to enter your product type, model, and manufacture date and you can download the instructions from there. I hope this helps.
1 Consider that most digital thermometers take a temperature in less than 30 seconds, quickening the temperature-taking process for squirmychildren.
2 Read the thermometer's instructions carefully. Never throw the instructions away. Keep them near your digital thermometer.
3 Wipe the thermometer probe with a soapy washcloth or a tissue dabbed in isopropyl alcohol or put on a clean probe, depending on your brand of thermometer.
4 Turn the thermometer on.
5 Use a gentle rocking motion as you insert the thermometer into the ear canal or rectum. Never push or cram the probe into the body. Forcing it causes pain, especially if there is swelling in the ear canal or rectum.
6 Listen for the beep.
7 Remove the thermometer.
8 Read the thermometer. If you see "ERR," you did not get good contact with the ear canal or rectum, and will need to take the temperature again.
9 Use the chart insert that comes with your thermometer to see what your normal reading should be.
10 Clean your thermometer probe with a soapy washcloth and/or isopropyl alcohol before storing.
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