Seiler Model 2000 Pibal Theodolite
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The Seiler Model 2000 Pilot Balloon Theodolite is a ML-47 specification theodolite. It was produced concurrently with the David White 6061 and appears very similar. It is made with different tooling so it is not identical and some parts are not interchangeable with David White 6061 units or later Warren-Knight units. The Seiler instrument is made predominantly with brass parts, the only major aluminum parts are the vertical circle guard and the finder scope assembly. It uses a round rheostat housing that is smaller in diameter than comparable David White instruments, and pin connectors on the lamps like early David White production.
Very few Seiler instruments were made perhaps only a single procurement contract of a couple hundred units.
| Drive Type | Positively Engaging Tangent Screw | Compass | Yes Fixed |
| Display Type | Micrometer .1 degree | Levels | 2 plate, bubble tube |
| Main Telescope | 42 mm 21x 2deg. | Mounting | 4 screw leveling head, 3.5"x8tpi |
| Finder
Telescope (on some units, other lack this) |
17mm 4x
10deg. single eyepiece |
Illumination | 3, 3
Volt lamps, scales reticule |
| Gun Site | Yes 1, 2 way foldable pair, main telescope | Weight (theodolite only) | 8.6 kg |