Description:
- Object ID: ALSA 2008.10.13
- Made by: Sokkisha
- Model: Red 1A
- Serial Number: 3289
- Date Made: Circa 1980 to 1983.
- Approximate size: 22cm lenght including lens cap and eyepiece), 17 cm width, 13 cm height to the top of the chrome handle.
- Accessories: Orange carrying case, 120-volt battery charger, black mount for inserting EDM into a tribrach, two rechargeable batteries, black cap for both lens, orange plastic lens cap.
- Condition: Good
Commentary:
The RED1A marked Sokkisha’s first entry into the electronic distance measurement market. The Red2 uses an Infra-red light beam to measure distances and has an accuracy of +/- (5mm+5ppm*D). With a single prism it can measure up to 1,600m, with a triple prism up to 2,500m and with nine prisms up to 3,000m under good conditions.
The Sokkisha company was founded in Japan in 1920 when it started making survey instruments. Over time it expanded its survey instruments products. The company changed its name to “Sokkia” in 1992 and in 2008 Topcon Corporation acquired Sokkia.
The top of the EDm has a label marked:- 37 MM + 13 PPM” label and an atmospheric correction table.
Source of Object: Donated by Grant Cross, ALS.
Notes: The Society has only one in their collection.
References: Visit article The Competition Heats Up – More EDMs and Sokkia History Sokkia History for additional information. Sokkisha Brochure “RED1A” in AGHS hard copy file.
Description by: Ed Titanich, October 23, 2024 and Gordon Olsson, November 27, 2025.