One of my favorite new toys is a laser thermometer. In reality, the laser is not used for sensing the temperature, it is only used to properly aim the non-contact infrared thermometer, but the ease of use, and the wow factor will surely cause people to refer to these as laser thermometers.
Here is how it works, you point the thermometer at the item to be measured, even from across the room (the closer you are the more accurate, but it still gives very good readings from a distance). The thermometer measures the infrared radiation given off by the object and calculates the objects temperature. A laser pointer is attached to the thermometer and alligned with the sensor so that it can be used as guide for pointing the thermometer in the right direction.
These infrared thermometers are useful for many applications. The obvious ones are air conditioning and heating, but it is also useful for plumbing. I was able to use my infared thermometer to trace a hot water pipe through a wall (the pipe was touching the inside of the wall, so the drywall heated up when hot water was run). By moving the laser pointer across the wall until the temperature peaked, I was able to find the route of the pipe behind the drywall.
These thermometers are surpisingly inexpensive. I just purchased one for $30, and there are many models and manufacturers making them. Several of the models of infra-red thermometers are listed below. When considering which one you want, check out the reviews and the product specifications.
Click on any of the images below for additional information on the displayed item or click to see additional choices for infra-red thermometers .
If you are looking for more advanced thermometers for imndustrial needs, you can find other temperature measurement devices described at http://www.industrial-needs.com.