Topcon AT-B2 32X Automatic Level
W-9 and vendor pack with every quote
Shipped direct from the manufacturer
The AT-B2 is the top of Topcon's three-model AT-B automatic level family: 32x magnification against 28x and 24x on its two siblings, 0.3 compensator setting accuracy, and a two-speed focusing knob neither sibling has.
01
This is the AT-B2, the top of Topcon's three-model AT-B family: 32x magnification against 28x and 24x on its two siblings
Topcon builds three automatic levels in the AT-B line; this listing is the AT-B2, the highest-spec of the three. Magnification runs to 32x here, against 28x on the AT-B3A and 24x on the AT-B4A. Compensator setting accuracy is 0.3 on this model. The exact unit is disputed between two Topcon documents, covered below. The AT-B2 alone carries a two-speed focusing knob, coarse and fine; its two siblings use a single speed. Standard deviation over a one kilometer double run of leveling comes in at 0.7 mm without an optional micrometer fitted. That is a survey routine reading a benchmark out and back to catch drift. It weighs 1.85 kg (4.1 lb). Between three near-identical levels, magnification and setting accuracy are what decide it.
02
Topcon's own catalog prints this level's width as 122 mm; Topcon's own regional specification sheet prints 130 mm, and both are genuine
Topcon publishes two different widths for the AT-B2. Its 2023 lasers and levels catalog prints 122 mm (4.8 in.), the same figure it gives the AT-B3A and AT-B4A. Its own AT-B2/B3A/B4A regional specification sheet prints 130 mm (5.12 in.) for the AT-B2 specifically, and 122 mm for the other two models on the same page. This listing states the width as 130 mm, matching the regional sheet rather than the catalog. Length, 215 mm, and height, 140 mm, agree across both documents. Only the width is in dispute, and we are not picking a side here. If the exact width decides how the level fits your case or a tripod head, call and we will find out directly.
03
The compensator's setting accuracy and working range print with two different units, and the two Topcon documents disagree on which is right
Setting accuracy and working range carry two different units across the same two Topcon documents. The 2023 catalog table prints 0.3 in. and plus or minus 15 ft., linear units. The regional specification sheet prints the identical numbers as 0.3 arc-second and plus or minus 15 arc-minutes instead. A compensator is the mechanism that keeps the sightline level, and re-levels it if the tripod gets bumped. Topcon prints it as an angular figure on one of its own documents and as a linear figure on another. Both are carried here rather than either being chosen.
04
The compensator self-levels across plus or minus 5 degrees, and a two-speed focusing knob is unique to this model in the AT-B line
A magnetic damping system with four high-tensile suspension wires keeps the AT-B2's line of sight level. It re-levels automatically if the tripod is bumped mid-job, across a self-leveling range of plus or minus 5 degrees. Minimum focus distance is 0.2 m (7.9 in.) from the front of the telescope, or 0.3 m (1 ft.) from the instrument's center. Topcon shares the center figure across all three AT-B models. The two-speed focusing knob, coarse and fine, is the one mechanical feature no Topcon document gives to the AT-B3A or AT-B4A. Standard deviation over a one kilometer double run of leveling, without the OM5 optical micrometer, is 0.7 mm. With the micrometer, an independent dealer states 0.5 mm, a figure this level's own Topcon documents do not publish directly.
05
No Topcon document checked publishes a warranty length for the AT-B family, though this listing states five years
Three Topcon documents were checked directly for a warranty term, a guarantee, or a year figure. They are the AT-B series brochure, the AT-B catalog table, and the levels category page. None of the three states one for this level family. A different Topcon product's own brochure does state a warranty explicitly, so this absence is not a general extraction failure across every document type. This listing states a 5-year manufacturer's warranty, a claim this listing makes rather than one Topcon's own materials confirm. Call before you order if a specific warranty term decides your purchase, and we will tell you exactly what currently applies.
06
The packing list is largely settled: a plumb bob and lens cap are genuine, and the one gap is a missing user manual line
Topcon's own AT-B2/B3A/B4A regional specification sheet lists a Standard Package for the AT-B2 by name. It includes the level, a hex wrench, adjusting pins, a vinyl cover, a plumb bob, and a cleaning cloth. Also listed: a lens cap, a user manual, and a hard carrying case. Topcon's own standard-package list for the AT-B2 also includes a user manual. An OM5 optical micrometer, sold separately, is not part of the standard package. Call before you order to confirm the manual ships and to check current stock.
07 FOR UNIVERSITIES, COLLEGES AND GOVERNMENT AGENCIES
My Surveying Direct ships every AT-B2 direct from Topcon, and institutions can order by purchase order
My Surveying Direct ships the AT-B2 direct from Topcon. Universities, colleges and government agencies can order by purchase order, with W-9 and tax-exemption documentation on file. A few things about this listing are not yet settled in Topcon's materials: this level's exact width, and the unit its compensator figures were meant to carry. Call us before you order, +1 888 850 6533, Monday to Friday, 9 to 5 Mountain Time. We will confirm current stock and exactly what ships with your order.
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Institutions only: universities, colleges and government agencies.
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REFERENCE
Specifications
Optics
| Magnification | 32x, the highest of Topcon's three AT-B models. The AT-B3A is 28x and the AT-B4A is 24x |
| Field of view | 1 degree 20 minutes |
| Minimum focus | 0.2 m (7.9 in.) from the front of the telescope; 0.3 m (1 ft.) from the instrument's center |
| Image orientation | Erect |
| Stadia ratio | 1:100 |
Leveling accuracy and compensator
| Standard deviation, one kilometer of double-run leveling | 0.7 mm (0.03 in.) without the optional OM5 optical micrometer fitted; 0.5 mm (0.02 in.) with the micrometer fitted |
| Self-leveling range | ±5 degrees |
| Compensator setting accuracy | 0.3, unit disputed between two Topcon documents: "0.3 in." on Topcon's 2023 catalog table, 0.3" (arc-second notation) on Topcon's own AT-B2/B3A/B4A regional specification sheet. The AT-B3A and AT-B4A are rated the looser 0.5 on both documents |
| Compensator working range | ±15, unit disputed between two Topcon documents: "±15 ft." on Topcon's 2023 catalog table, "±15'" (arc-minute notation) on Topcon's own AT-B2/B3A/B4A regional specification sheet, shared across all three AT-B models |
| Focusing knob | Two-speed, coarse and fine. The AT-B3A and AT-B4A use a single-speed knob |
| Compensator mechanism | Magnetic damping system with four high-tensile suspension wires; automatically re-levels the line of sight if the instrument is disturbed during use |
| Horizontal circle | Reads directly in 1 degree or 1 gon units, free rotation from zero, readout window below the eyepiece |
Build and environment
| Dust and water protection | IPX6 (IEC 60529:2001) |
| Operating temperature | -20°C to 50°C (-4°F to 122°F) |
| Size | Topcon publishes two different widths for this instrument. Its 2023 lasers and levels catalog prints 122 mm (4.8 in.), the same figure it gives the AT-B3A and AT-B4A. Its own AT-B2/B3A/B4A regional specification sheet prints 130 mm (5.12 in.) for the AT-B2 specifically, against 122 mm for the other two. Both are Topcon documents and the two are shown here unresolved. Length 215 mm and height 140 mm agree across both |
| Weight | 1.85 kg (4.1 lb) |