Handheld Anemometers
Cup shaft is stainless steel revolving between stainless ball bearings. Folding cups are made of Lexan. Instrument housing is black ABS material with 1/8" thick wall. Swept diameter on cups 5 3/4".

Generators
Cup-type: 7 1/2" swept diameter, weighs 4 oz. Output linearly proportional to 8 MPH. Black Lexan housing impervious to shock, vibration, sunlight and ice. Calibrated to a master to be interchangeable. Thrust and joint bearings are O-ring mounted, self-aligning to Beryllium copper shaft, impervious to moisture and salt air. Bearings are self-lubricating Rulon J for stability under extreme conditions.

Distributor
Wind Vane swept diameter 7 1/2". Housing and bearings same as generator (above). Five solid brass 4-40 stud terminals for antenna rotor type cable. Permanent magnet actuates 8 hermetically sealed magnetic reed switches for long life. Diode logic system permits five wire operations.

Air and Water Sensors
Air: 3" overall height; 2" housing diameter. Probe is nickel-plated brass, 1/2" O.D., 1" long. Sensor element is a precision thermistor, a solid state device which changes its resistance inversely proportional with temperature from 150,000 Ohms at low end to 1,500 Ohms at high end. Interchangeability of thermistors is +/- 0.2°C; time constant 10 sec.
Water: Thermistor specifications identical to Air Sensor. Housing is solid bronze rod, bored to accept thermistor in its very end and potted wiring. 3" long, 3/8" O.D. Water sensor is intended for boats, pools and hot tubs. For any other application, consult Maximum.

Current Requirements
Instruments requiring power are supplied with outlet-mounted transformers for 120-Volt AC household current. Where power is not available, most instruments are available to run off optional 12VDC power source. European voltages are available as an option.