Angle scale illuminator lamp, for Kern Theodolite (Type-A)

Description

You are purchasing one angle scale illuminator for various models of Theodolites made by Kern.
We make two types of illuminators for Kern Theodolites, and another type for Wild Theodolites. This one is "Type-A" for Kern. Depending on the model of your Theodolite you may need this one, or the "other" one (Type-B).
You can tell which one fits your Theodolite by checking the images in the description. This one fits Theodolites that have a large aperture where light directed by a mirror enters which is surrounded by two smaller holes opposite each other as shown in the "detail image" of a Kern Theodolite along with the pictures of the illuminator lamp. Note that the Theodolite is NOT included, you are buying only the illuminator. Another image shows the illuminator installed in the theodolite. If the mount for the illuminator on your Theodolite looks different that what's shown in this listing you probably need a Type-B illuminator, sold on a different page, just search again in eBay for "Theodolite Illuminator" to find it.
The illuminator lamp is battery powered, the internal replaceable batteries will provide several hours of illumination before they need to be replaced. To turn the lamp on or off you simply twist the back cover, clockwise turns it on CCW turns it off. Unscrewing it all the way provides access to the battery for replacement. A soft "ring" of light visible from the "outside" is produced whenever the unit is on. This light is to remind you to turn the lamp off when your not using it. The uniform light produced by this unit is light green in color, which makes it easy to read the angle scale(s) in the Theodolite.
The angle scales in these incredible old Theodolites are beautiful, it's fun to practice your skill at reading the angles with repeatable precision. The illuminators are useful when your actually making measurements in the field, or if your just showing the angle scales to a friend. With the illuminator lamp you no longer have to mess with mirrors to get the best light on the scales. The light is bright enough to be used outdoors, but not too bright for indoor or nighttime use. It's just right for reading angles to a high precision, indoors or out.
Makes a great gift for anyone you know that has a collection of Theodolites or Transits, it's very likely they have models from both Kern and Wild.
The illuminator uses two 2032 batteries, which are supplied installed in the device.