Wndsn Custom Latitude Horary Quadrant Telemeter (LHqTM) 8x6x500q90i35 High-Viz

Wndsn Custom Latitude Horary Quadrant Telemeter (LHqTM) 8x6x500q90i35 High-Viz

Regular price €60.00 Sale

International shipping available (see our shipping rates and crisis info).

[Custom equal hour quadrants with calendarium for specific latitudes. Select the closest latitude from the dropdown or choose full custom for one-degree steps with custom value engraved. Please allow ~10-14 working days for fulfillment.]

Model (v. 21A). Changes are: 8° Telemeter scales, negative inclinometer scale, new font.

A tool for education, makeshift navigation, and rangefinding, the double-sided Wndsn Horary Quadrant Telemeter enables you to do more than merely guessing distances. It lets you measure angular size and compute distance, height or depth of object, altitude, or elevation, it allows computation of sine, cosine, and tangent for a given angle and utilize the baked-in trigonometry to find the desired value by aligning the provided string across the various scales.

The backside features functions derived from ancient astrolabes; a degree and slope quadrant, a shadow square, as well as sine and cosine arcs and an inclinometer scale with horary lines showing the equal hours of the location the quadrant is calculated for plus a calendarium, enabling the quadrant side, which by now not only enables the user to measure the sun’s altitude on a given date but in addition, to also take the time and visualize daylight hours over the course of a year. By using our string as a plumb line, we enable multiple ways of sighting, plus we let you perform various trigonometric operations with the shadow square and sexagesimal scale, increasing the usefulness of the instrument with the list of applications topping 75 currently.

Using a Wndsn Horary Quadrant Telemeter to determine latitude (at night with Polaris), calculate declination of the day with the respective arc, and a measurement of the Sun altitude (via backsighting), one can derive at least 18 data points and in fact calculate all of them directly on the device.

The best tool is the one you have with you, on you. Wndsn Telemeters are wallet-size distance and altitude nomographs developed in our applied science lab: Wndsn Telemeters combine a thousand years of civil engineering, surveying, navigation, and astronomy in one durable, low tech, high utility instrument that can be brought anywhere, is self-containing, and independent of external, modern technologies. Wndsn Telemeters are naked-eye tools that offer various means of measuring angular size, as well as graphical computers providing functions to process or convert the measured values. Their purpose is to help you navigate using known landmarks or astronomical features, to get a "second opinion" to cross-check values obtained with different means, or in emergency situations when other methods fail or are unavailable.

Made in Germany. Our instruments are engraved to the highest precision of tools and materials with every scale mark optimized for the size of the instrument based on in-house computer-calculated tables from historical and contemporary mathematical formulas.

  1. Wndsn Custom Latitude Horary Quadrant Telemeter, double-sided
  2. Dyneema string, 0.35 mm turquoise, pre-configured in the required length
  3. Plumb line weight, tungsten carbide
  4. Wndsn Quadrant morale patch; turquoise & white on black (as long as stock lasts) 
  5. Printed 32-page Telemeter pocketbook (in English and German)
  6. Digital 240-page instructions manual (in English, German on request)

See also: Quadrant Telemeter Tutorials

[Note: Due to the manual production process, slight variations in finish can occur.]


  • 3.4" x 3.4" (8.5 x 8.5 cm)
  • Matte white surfaces, black core
  • ~1/8" (3.2 mm) Acrylic stock, laser engraved