The CST/berger DTEP diagonal eyepiece works with the following instruments:
- CST/berger DGT-02 theodolite (56-DGT2)
- CST/berger DGT-10 theodolite (56-DGT10)
- David White DWT-10 theodolite (46-8890)
The Diagonal Eyepiece is used for use in areas where large building or obstacles prevent an ideal working distance between the Theodolite and target object. The Solar Filter is used on the Theodolite to prevent glare under bright sunlit conditions, or when the sun must be sighted to determine position.