Quick Answer
What is the Nikon AC-2S?
See also: David White LM800 Automatic Level
See also: Pentax AP-241 Automatic Level
The Nikon AC-2S is a 32x magnification automatic optical level with 1.5mm per km accuracy and a ±12' compensator range, suited for construction layout and precision earthwork applications.
Nikon AC-2S — Complete Specs, Manual & Guide
Category: Optical Level | Brand: Nikon | Model: AC-2S
The Nikon AC-2S is a professional automatic optical level widely used in construction surveying and earthwork layout. The 32× telescope provides clear rod readings at long range, and the automatic compensator delivers a stable horizontal reference with minimal setup time. The AC-2S is known for its durability and optical clarity, making it a staple instrument on commercial and residential construction sites.
Nikon AC-2S Full Specifications
| Magnification | 32× |
| Objective aperture | 40mm |
| Accuracy (standard deviation) | 1.5mm per km double run |
| Compensator type | Pendulum (air damping) |
| Compensator range | ±12' |
| Field of view at 100m | 2.0m |
| Minimum focus distance | 0.5m |
| Circular level sensitivity | 10'/2mm |
| Stadia ratio | 100:1 |
| Weight | 1.7 kg |
| Tripod mount | 5/8" × 11 thread |
Included Accessories
- Carrying case — Hard shell with foam lining
- Sunshade — Objective lens shade for outdoor use
- Lens brush and cloth — For optical cleaning
- Adjustment pin — For cross-hair reticle adjustment
Frequently Asked Questions — Nikon AC-2S
How does the Nikon AC-2S compare to the Nikon AX-2S?
The AX-2S is a higher-magnification (40×) version of the same instrument body with improved accuracy of 0.7mm per km. The AC-2S's 32× magnification is adequate for most construction applications and is more common in contractor rental fleets. The AX-2S is preferred for higher-accuracy work such as benchmarking and first-order leveling.
What rod types work with the Nikon AC-2S?
The AC-2S works with any standard metric or English staff rod, including Philadelphia rod, grade rod, and fiberglass contractor rods. The 32× magnification and stadia lines enable distance measurement to the rod using the stadia ratio of 100:1.
Does the Nikon AC-2S have a horizontal circle?
Yes. The AC-2S includes a 360° horizontal circle graduated in degrees. This enables basic angle measurement for offset layout and reference bearing establishment, though the circle is not as precise as a total station's horizontal angle measurement.
How do I check and adjust the AC-2S collimation?
Perform the two-peg test: set up midway between two rods and read both, then move to near one rod and read again. If the difference between readings changes, the collimation (line of sight) is off horizontal. Use the adjustment screws on the reticle to correct. Nikon service manuals provide the full two-peg adjustment procedure.
Related models: David White LM800 | Pentax AP-241
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