Comparison of different Telemeter models

Telemeters come in various models, with scales in different resolutions and in different materials. The instruments are named, e.g.: "Wndsn Pocket Telemeter 7x7x500 Brass" describing size; α, S, D, q, and i scales; as well as material.

Type Scales Material Precision Notes
α S D q i
Pocket 7 7 500 n/a n/a Plastic/Brass/Copper 0.05° up to 7°
0.1° up to 14°
0.15° up to 21°
nomograph scales for calculations
credit card size
7 10 500 n/a n/a Brass
Quadrant
Telemeter
7 7 500 90 30 Acrylic/Brass 0.05° up to 7°
0.1° up to 14°
0.15° up to 21°
nomograph scales for calculations
credit card size
quadrant backside
transversal inclinometer scale
Expedition 10 10 1000 n/a n/a Acrylic/Brass 0.05° up to 10°
0.1° up to 20°
0.15° up to 30°
nomograph scales for calculations
easy to use with all scales based on decades
Pendant 13 n/a n/a n/a n/a Acrylic/Brass/Copper 0.2° up to 13° only measuring scales
Quadrant n/a n/a n/a 90 90 Acrylic 1° up to 90° only measuring scales
(α = angular size of the object observed; S = known size of the object observed; D = distance from eye to observed object of known size; q = angular size from horizontal, i = angular size from vertical.)

D scale division configurations by Telemeter model

D scale sections Divisions by model
7x7x500 7x7x500q90i30 10x10x1000
1-5 - 1 1
5-10 5 1 1
10-50 5 1 1
50-100 5 5 5
100-150 10 5 5
150-300 10 10 10
300-500 50 50 50
500-700 - - 50
700-1000 - - 100

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