Aneroid barographs are used to measure and record the history of atmospheric pressure. The measuring element in our barographs is a set of 7 aneroid capsules with a diameter of 62 mm. This set is manufactured of a copper-beryllium alloy that essentially eliminates age-hardening, hysteresis, and elastic after effects that could otherwise degrade the accuracy. The influence of temperature on the set of aneroid capsules and the transmission system is compensated by use of bimetal components over the full measuring range and for temperatures between -30 to +40 °C (-22 to 104 °F). All contacts in the movements are jeweled to reduce friction. Fischer barographs are used by navies and weather services, worldwide.

For each model there is a choice of mechanical wind-up clockworks or quartz clockworks, which can be shifted in an instant for daily, weekly or monthly revolution. The actual periods are 25.6 hr, 176 hr, and 783 hr. The recording instruments are delivered complete with fibre pens and a year's supply of recording charts. Weekly charts are the standard that are provided unless requested otherwise. Note that the mechanical clocks do not have a monthly mode. Weekly rotations are the most common used with barographs.

Fischer instruments are unique in offering an option on each model with enhanced dampening for barograph use at sea. After you chose your model and timing option, the extra dampening option can be added. There is no need for this option for land based operations.

The paper charts are the same size for all models: 92mm tall by 302 mm long. Charts marked in inches of mercury are also available on request.