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| Features ETH-302 / ETH-305 / ETH-310 / ETH-320 The ETH-300 Series features model numbers that reflect angle accuracy and have common features. All models have dual displays, and a detachable tribrach. |
The ETH-302 has 2" accuracy, ETH-305 has 5", the ETH-310 has 10", and the ETH-320 has 20" angle accuracy. The ETH-302 and ETH-305 are equipped with compensator.
Horizontal and vertical angles can be observed simultaneously on the large 2 line, back-lit LCD displays, and vertical angles can be easily converted to percent slope with one key stroke. Other standard features include a horizontal angle zero set, automatic power off to conserve batteries, and a battery life indicator on the LCD display. Four AA alkaline batteries provide 25 - 28 hours of continuous operation.
| Specification |
ETH-302 |
ETH-305 |
ETH-310 |
ETH-320 |
| Detachable tribrach |
| Telescope |
| Magnigication |
30 X |
| Objective aperture |
45 mm |
| Resolving Power |
3? |
| Field of view |
1? 30? |
| Minimum Focusing Distinace |
1.35 m |
| Stadia constant |
0 |
| Focusing |
2 Speed |
| Angle Measurement |
| Type |
Incremental Reading System |
| Vertical |
Single |
| Horizontal |
Dual |
| Minimum Display |
5?
( 1/5 selectable ) |
5?
( 1/5 selectable ) |
10?
( 5/10 selectable ) |
20?
( 10/20 selectable ) |
| Accuracy ( DIN 18723 ) |
2? |
5? |
10? |
20? |
| Display |
| Type |
dot matrix LCD |
| Display |
Panel 2 side |
| Key Panel |
Japanese + Others |
| Vertical axis |
| single |
axis |
| Compensater |
| |
Yes |
No |
| Water Resistantance |
| |
JIS Class 4 |
| Sensitivity of Vials |
| Plate Vial |
30? / 2mm |
40? / 2mm |
| Circular |
Vial 8? / 2mm |
| Warning Buzzer |
| |
Yes |
| Optical Plummet Telescope |
| Magnification |
3 X |
| Focus Range |
0.5m - ? |
| Data Communication |
| |
NA |
| Power Source |
| Type |
4xAA Dry Battery |
| Operation Time |
Alkaline 25 6 28 hrs / ( NiMH 25 - 28 hrs ) |
| Ambient Temperature |
| |
-10 - +50 ?C |
| Size&Weight |
| Sise |
W166 x 329 x 155mm |
| Weight |
4.6kg |
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