It's not ... but it's pretty good compared to others available at home.
The advantages it that it gives close to core temp,
you don't get weird results from talking or moving the probe around,
and you don't get variations to changes in skin blood flow (forehead pads).
Axillary
There are several ways to take temperature, including oral, rectal, ear, forehead, and armpit measurements. The most accurate method is generally considered to be a rectal temperature measurement.
The most accurate method for measuring a dog's rectal temperature is to use a digital thermometer specifically designed for pets. Insert the thermometer gently into the dog's rectum and wait for the reading to stabilize, usually within a minute. This method provides the most precise and reliable temperature measurement for dogs.
The same,if you have accurate reading of measurement in graphical method you can precisely measure so there will be no error, in using analytical method you must have an exact & perfect calculation to have an perfect product. .
The recommended method for accurately measuring the internal temperature of food using an oven temperature probe is to insert the probe into the thickest part of the food, making sure it does not touch any bones or the pan. Wait for the temperature reading to stabilize before removing the probe to get an accurate measurement.
The most accurate method for determining the floor measurement of a room is to measure the length and width of the room using a tape measure, and then multiply the two measurements together to calculate the total square footage.
The direct measurement method involves physically measuring the volume of an object by using instruments such as a ruler, measuring tape, or graduated cylinder. This method provides an accurate measurement of the volume of regular-shaped objects by directly calculating their dimensions.
The most accurate method for measuring air temperature is using a high-quality digital thermometer placed in a shaded area away from direct sunlight and heat sources.
The most accurate method for measuring a canine's body temperature using a canine thermometer is to insert the thermometer rectally into the dog's anus.
Touch alone is not an accurate method for determining the temperature of an object because our sense of touch is not precise. It can give a general idea if something is hot or cold, but to get an accurate temperature measurement, it is best to use a thermometer.
Laser Ceilometer
The most accurate method for determining sitbone width is by using a specialized tool called a sitbone width measurement device. This device is placed on a flat surface, and the individual sits on it to create an impression of their sitbones. The distance between the two impressions gives an accurate measurement of the sitbone width. This method is effective in providing precise measurements for selecting the right bicycle saddle or chair.