Design and ergonomics
Slender, the Thomson Thermo FH2 is easy to handle and holds well in hand, despite a certain slipperiness of the shiny white ABS plastic that composes it.
Rather well built and without visible screws, it is easy to maintain. However, it is not waterproof (IP22) and therefore cannot be passed under water. Being a non-contact thermometer, it is less subject to contamination and simply wiping its case with a cloth soaked in 70% alcohol is enough to disinfect it as a precaution.
The FH2 is powered by two AAA (LR03) batteries which can be accessed easily by pressing the base of the cover that protects them. The manufacturer promises an autonomy of 500 measurements.
The use of the thermometer is easy enough to take first measurements without necessarily reading the instructions. Consultation of the latter is nevertheless recommended, in particular to ensure that the thermometer is handled correctly, as well as to make any adjustments if necessary. The manual also provides medical notions on how body temperature can vary during the day, and specifies normal and fever temperature ranges according to the type of measurement, which is always instructive.
To take a measurement, simply position the thermometer at a distance between 3 and 5 cm from the center of the forehead, just above the eyebrows. The Thermo FH2 incorporates a LED just above its probe, illuminating the targeted area in blue for easier positioning.
The fever in colors and in memory
We appreciate the change in color of the backlight of the screen, which changes to orange in the event of a temperature between 37.2 ° C and 38.2 ° C and to red beyond, synonymous with a high fever.
The last nine measurements are saved in the instrument’s internal memory. It is accessed by pressing the Mem button when the thermometer is off (press once for measurement 1, press twice for measurement 2, etc.).
The Thermo FH2 is also able to measure the temperature of objects, liquids or food. All you have to do is switch to a specific mode to perform these measurements, which is done simply by pressing and holding the ignition button. The values are saved in the same way as those of body temperatures.
Accuracy and speed
Fast and persistent measures
The Thomson Thermo FH2 is ready in just 2s. As often with infrared thermometers, the measurement is very fast since it only takes a second. It is also necessary to wait only one second between two measurements, which makes it possible to chain them quickly to ensure the persistence of a temperature, for example.
There is no need to multiply the measurements, however, since the repeatability reaches 95% – there is only a small difference between several successive measurements taken at the ideal point (in the center of the forehead, above the eyebrows).
Good accuracy despite some variations
Be careful, however, to position the thermometer correctly, because if you move away from the center of the forehead, the results can differ by almost 20% from the ideal position. Nothing catastrophic, the value measured around the latter being then slightly higher according to our tests (knowing that these also depend on our own morphology).
We nevertheless observe a good precision, the FH2 succeeding rather well in detecting the changes in temperature of our body. Deviations from our reference thermometer are logically observed when our temperature has dropped to the maximum, the frontal measurement offering less stability than the rectal measurement. Nothing abnormal, the accuracy of the Thermo FH2 is quite satisfactory, especially for a forehead thermometer.