So when you read a barometer the needle will gradually rise up the scale from day to day. In most cases, a high pressure cell means calm, clear, sunny weather, and as the needle moves up the scale, the increase in pressure is suggesting fine, or “fair” weather is on the way. Similarly, as the high passes over the daily change in the needle’s position will show a decrease in the air pressure, and suggests that if this continues you will experience a period of low pressure. Of course, as in most things to do with weather and life, it’s not quite that simple to read a barometer, which means that although the pressure changes recorded by your barometer have some predictive value, they won’t always be right. For example, if the center of a high passes at a certain distance from where you’re located, you may not experience the fair weather that your barometer predicted before the pressure, and the needle begins to fall. Another general rule of thumb in “how to read a barometer” is that very high pressure readings may indicate windy conditions to follow. The reasoning behind this is that an extreme reading usually means a high pressure gradient to the next low, and high pressure gradients mean strong winds. This rule doesn’t apply in quite the same way to very low pressures. While the pressure gradient will certainly be high, the low is actually the focus of the winds, and unless you happen to be under the eye of a hurricane, the strong winds have already arrived. But you can, if you know how to read a barometer ,turn it into a very useful forecasting tool, but you will need to keep records of the weather to do so. Apart from pressure changes, you can record wind direction, wind direction changes, cloud cover and type of clouds, and the occurrences of rain, snow or thunderstorms.

So let’s recap on what you need to know about how to read a barometer:

Get a regular mercury barometer and start measuring the atmospheric pressure around you by simply measuring how high the mercury column goes up or down. The way you’re going to measure it is from bottom to top using a simpler ruler, keeping in mind that under regular atmospheric pressure the vacuum at the top of the barometer is at almost 30 inches (29.92 to be more precise). When the mercury column drops below that point, we’re experiencing a drop in atmospheric pressure and that means we’re going to get bad weather. This thing works viceversa as well so if the mercury column rises you can expect nicer weather. All in all learning how to read a barometer is a good thing if you’re an outdoor enthusiast and want to know how to plan your trips.

The switch from the aneroid barometer to the digital one was made when people realized that most aneroid barometers on the market require a calibration curve to yield accurate pressures, and most do not have such a curve in use, and as a result they may not provide accurate barometric pressure. The precision range offered by digital (electric) barometers is remarkable considering the fact that they can typically provide pressures to within ±1 mb within the mid range of 1030 to 990 mb.

The digital barometer was one step ahead of it’s predecessors being more accurate, smaller, and easier to purchase. Buying a digital barometer nowadays is as easy as 1-2-3 considering you already have the money you could visit almost any niche specific electronics store and acquire one for your personal usage. I suggest that you should first ask for the barometers  precision range, battery durability and usage under difficult weather conditions so you make sure you’re not paying for an useless digital barometer.

All in all, a digital barometer is a state of the art piece of equipment meant to aid the really outdoor enthusiastic lovers and not only. A digital barometer can also be used for weather forecasting or surface weather analysis.

Below is the picture of a digital barometer.

Druck digital barometer