Wndsn Instructor High-Viz Quadrant Telemeter (wqTMx2) 75x7x500q90i30 White Acrylic

Wndsn Instructor High-Viz Quadrant Telemeter (wqTMx2) 75x7x500q90i30 White Acrylic

Regular price €45.00 Sale

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

Note: This is a scaled-up version of our standard Quadrant Telemeter model, it is twice the size of the orginal, all features are the same with some scales graded in smaller increments, where applicable. It is ideal for instructors, for demonstration and teaching purposes. This edition comes with the same instructions manual as the regular qTM.

A tool for makeshift navigation and rangefinding, the double-sided Wndsn Pocket Quadrant Telemeter enables you to do more than merely guessing distances. Find an object of known size, or distance, or angle and measure with the appropriate scales 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. By using our string as a plumb line, we offer three additional 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. The Quadrant Telemeter 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.

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.

Wndsn Quadrant Telemeters continue to spark and promote interest in contemporary metrological science and ancient navigational history as well as educational astronomy.

Made in Germany.

  1. Wndsn Pocket Quadrant Telemeter, double-sided
  2. Dyneema string, 0.27 mm turquoise and red, pre-configured in the required lengths
  3. Plumb line weight, tungsten carbide (similar to the one pictured)
  4. Custom-made carton sleeve
  5. Printed 32-page Telemeter pocketbook (in English and German)
  6. Digital 240-page full manual (in English, German on request)

qTM Pocketbook / Anleitung:

See also: Quadrant Telemeter Tutorials

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


  • 6.8" x 4.4" (17 x 11 cm)
  • Matte white surfaces, black core
  • ~1/8" (3.2 mm) Acrylic stock, laser engraved