General Instructions for setting up Barometers, Hygrometers and Thermometers.

This barometer was designed to give the user accurate air pressure readings from sea level to an altitude of 7000 feet. Before leaving the factory your barometer was calibrated to standard air pressure at sea level. For your barometer to give you optimum results, you will have ro re calibrate it to your local barometric pressure before use.

Locate your barometer in an are where it will remain undisturbed. Do not position it in direct sunlight, as this could cause inaccurate readings.

You need to calibrate your barometer to your location. This can be done by getting the local pressure from a local radio or television station. Use a small slotted screwdriver to turn the small screw on the back of the barometer case to adjust your barometer until the black pressure indicator hand points to a reading that corresponds to your known local barometric pressure. Your barometer has now been calibrated.

For daily operation of your barometer, place the gold pointer attached to the lens directly over the black pressure indicator hand.

This will allow you to measure any change in pressure that may have taken place. It is the amount of change in pressure and the rate of that change that will be an indicator of the weather.

The following basic rules will hold true in using the barometer to predict weather conditions:
 

• A fast rise in barometric pressure means good weather of short duration.
• A rapid drop in barometric pressure means disturbances nearby - showers of short duration.
• Regular elevation of barometric pressure usually will indicate clear, dray weather conditions (cold and dry in the winter)
• A drop of 2-3 tenths of an inch per 24 hours indicates a depression some distance away.
• Drops of 1-2 tenths per hour means disturbances near by, of short duration
• Steep drops of 6-10 tenths within a 4-5 hour period indicates coming rain and a storm with strong winds.

Hygrometer

Thermometer

This dial thermometer is designed for indoor use only and provides an accurate measurement of air temperature in the immediate vicinity of the instruments location. Please locate the instrument indoors in a location that represents average air temperature. Avoid locations next to drafts, ovens, air conditioners or heat registers.

Your thermometer was pre set at the factory and will not normally need adjustment. Allow the thermometer to operate for at least 24 hours once it has been located before determining if it is operating properly.

If you find that an adjustment must be made, then do very carefully. If you through the back of the instrument you will notice a coil spring that is held in place by a gold color support bracket. This support bracket lies against the dial and has a small tab that comes away from the dial at a right angle (). This small tab has a red plastic pin going through it and holding the coil in place. Do not touch this red plastic pin or the coil at any time. To adjust the reading on the dial of your thermometer use a small screwdriver to push on the side of the metal tab. This will turn the entire support bracket. The support bracket should be turned in whichever direction will give you the reading that you desire.

Operating tolerance: +/- Two degrees Fahrenheit