Oakton WD-03316-70 - Aneroid Barometer, Inches Mercury

• Selectable digital display of C or F degrees for ease of use
• Wall-mount barometer for ease of reference
• Measures from sea level up to 2,000 feet for a range of ability
• Batteries or external power not required
• Built-in, bimetallic element for temperature compensation for the aneroid capsule for pressure reading accuracy

The Oakton 03316-70 aneroid barometer has a barometric pressure range readout of 930 to 1070 mbar, and 27.5 to 31.6 inches Hg. Oakton barometers are used to measure atmospheric pressure and temperature in indoor applications. This barometer has a built-in, bi-metallic element for temperature compensation for the aneroid capsule for pressure reading accuracy. It has a selectable digital display of C or F degrees for ease of use, and a wall-mounting for ease of reference. It is used to measure at an altitude between sea level and 2000 feet. Batteries or external power are not required.
 
The 03316-70 aneroid barometer has a resolution of 1 mbar + or - 0.01 inches Hg, accuracy + or - 1 mbar + or - 0.03 inches Hg. Temperature range of -5 to 55 degrees C (-22 to 132 degrees F), resolution 1 degree C (2 degrees F), accuracy + or - 1 degree C (+ or - 1.8 degrees F) with kerosene-filled glass thermometer sensor. Its dimensions are 7.125 (D) x 2.125 (W) inches, and it comes with a bezel for ease of bulk-head mounting, and a brass case.
 
An Oakton aneroid barometer monitors impending weather changes and temperature in indoor applications.

Introduction

Thank you for purchasing an OAKTON Barometer. You have one of three models. All models are ideal for monitoring impending weather changes and temperature. They are intended for indoor use only.

Aneroid barometers 03316-70 and -72 feature a built-in bimetallic element (which provides temperature compensation for the aneroid capsule) and a glass thermometer.

Barometer 03316-80 features a °F/°C selectable digital display

Aneroid barometer with inches Hg scale
(model number 03316-70)

Aneroid barometer with mm Hg scale
(model number 03316-72)

Barometer with digital thermometer
(model number 03316-80)

Operation

Barometric pressure readings require no external power.
Note: "High pressure" and "low pressure” are relative terms. There is no distinct point on the scale that clearly defines where low pressure and high pressure begins, and vice versa.

Setting the reference needle

Your barometer features a reference needle (gold) and an indicator needle.

• The reference needle shows where the barometric pressure started.
• The indicator needle shows the current barometric pressure.

Use the adjusting knob on the front center of the unit to align the gold reference needle on top of the indicator needle. After several hours, the indicator needle will move upward move downward, or remain still.

• Upward movement means improved weather
• Downward movement means deteriorating weather (rain or snow).
• No movement means no weather change

Sea level corrections

Since air pressure changes with altitude, you must compensate your barometer accordingly. The higher you are above sea level, the lower (to the left) the indicator needle will move on the barometer.

Example: At at an altitude of 100 meters (330 feet), the barometer will drop about 12 millibar (mb). To compensate for that altitude, simply add back the 12 mb. Therefore, a reading of 1000 mb at sea level becomes 1012 mb at 100 meters altitude (see the sea level conversion chart below). To adjust the barometer to your altitude, turn the adjusting screw on the back center of the instrument to adjust the indicator needle.

We recommend that you adjust your barometer after unpacking, and again about once a year.