The unit does NOT shut down after 15 seconds and the unit remains running. Why?
1. Check if you are in "Lock" Mode. There shall be "Lock" icon on the LCD display between time and readings.
If Yes, it will keep measure up to 1 hour without stop. Or you can press the measure/scan button 1 time, the lock mode will be off.
If No, please refer to below solution.

2. Take battery out of the unit and wait for 30 sec. to 1 min, and then insert the battery back. The unit shall be back to original default - reset to 0 for everything. You can decide if you would like to have "clock mode" on (by setting time) or not. If you would like to have clock mode on, after time setting, the LCD will display room temperature after 15 seconds pending. If no, the unit will turn off / shut down without any display on LCD screen after 15 seconds pending.

It is normal. If you have set the" clock" mode, after "power-off", room temperature & clock will be showed on the screen all the time.

	(Power off)		(Power on)

Yes. Please link here for the details offering.http://www.zytemp.com/infared/emissivity.asp

* Note: The information is for reference only as the emissivity may change because of the surface treatments.

Yes. We can make them default in on not off but MOQ500pcs above is requested.

The TCT series is both a stainless steel probe and an infrared thermometer that allows you to simply point at whatever you're cooking to get a temperature read. Although infrared temperature readers are less accurate than probes, they allow professional inspectors to test a lot of food without contacting them. There will be less cleanup and less danger of cross-contamination.
When you pull the unit out, it looks like an ear magnifier without the cone tip attached. Press the measuring button and the infrared beam glows in front, instantly producing a temperature reading on the display screen if you happen to be pointing at anything. The pointed probe flips down from the handle. If measuring by infrared, hold the gun 1 to 10 inches away from your target, which needs to be at least 1/2 inch in diameter.
If there's smoke or steam, hold the unit back and at an angle to avoid interference. When using the probe, hit the Select button to switch to the probe function, insert the tip at least 1/2 inch in, and hold it while the probe graphic flashes on the display; when the probe beeps, the temperature shows on the display.

The definition of IP Rating as below:
Example of rating : IP65

IR Thermometer is applied in food service for business purpose more then home. If customers would like to use them, we will strongly recommend them to measure the temperature with certain distance or after cooling (not while cooking). After all, most users will use it for food storage temperature more frequently- spot check like FDA.

Yes. The reason is because there are 2 CR2032 batteries in TN265L and TN205L. One is used for laser function and the other is for LCD/temperature reading. The laser will still work even if the temperature battery ran out. There is no such problem in TN253L model.