| MODEL | 
iM-52 | 
iM-55 | 
| Telescope | 
| Magnification / Resolving power | 
30x / 2.5” | 
| Others | 
Length : 171mm (6.7in.), Objective aperture : 45mm (1.8in.) (48mm (1.9in.) for EDM), Image: Erect, Field of view: 1°30’ | 
| (26m/1,000m), | 
| Minimum focus: 1.3m (4.3ft.) Reticle illumination: 5 brightness levels | 
| Angle Measurement | 
| Minimum Display (selectable) | 
1″/5″ (0.0002 / 0.001gon, 0.005 / 0.02mil) | 
| Accuracy (ISO 17123-3:2001) | 
2” | 
5” | 
| Dual-axis compensator | 
Dual-axis liquid tilt sensor, working range: ±6’ | 
| Collimation compensation | 
On/Off (selectable) | 
| Distance Measurement | 
| Laser output*1 | 
Reflectorless mode : Class 3R / Prism/sheet mode : Class 1 | 
| Measuring range | 
Reflectorless*3 | 
0.3 to 500m (1,640ft.) | 
| (under average conditions*2) | 
Reflective sheet *4/*5 | 
RS90N-K: 1.3 to 500m (4.3 to 1,640ft.), RS50N-K: 1.3 to 300m (4.3 to 980ft.), RS10N-K: 1.3 to 100m (4.3 to 320ft.) | 
 | 
Mini prisms | 
CP01: 1.3 to 2,500m (4.3 to 8,200ft.), OR1PA: 1.3 to 500m (4.3 to 1,640ft.) | 
 | 
One prism | 
1.3 to 4,000m (4.3 to 13,120ft.) | 
| Minimum Display | 
Fine / Rapid : 0.0001m (0.001ft. / 1/16 in.) / 0.001m (0.005ft. / 1/8 in.) (selectable) Tracking / Road : 0.001m (0.005ft. / 1/8 | 
| in.) / 0.01m (0.02ft. / 1/2 in.) (selectable) | 
| Accuracy*2 | 
Reflectorless*3 | 
(2 + 2ppm x D) mm*6 | 
| (ISO 17123-4:2001) | 
Reflective sheet*4/5 | 
(2 + 2ppm x D) mm | 
| (D=measuring distance in mm) | 
Prism*7 | 
(1.5 + 2ppm x D) mm | 
| Measuring time*8 Fine | 
0.9s (initial 1.5s) | 
| Rapid | 
0.6s (initial 1.3s) | 
| Tracking | 
0.4s (initial 1.3s) | 
| OS, Interface and Data management | 
| Operating system | 
Linux | 
| Display / Keyboard | 
Graphic LCD, 192 x 80 dots, backlight : on/off (Selectable) / Alphanumeric keyboard / 28 keys with backlight | 
| Control panel location | 
On both faces | 
On single face | 
| Data storage | 
Internal memory | 
Approx. 50,000 points | 
| Plug-in memory device | 
USB flash memory (max. 32GB) | 
| Interface | 
Serial RS-232C, USB2.0 (Type A, for USB flash memory) | 
| modem (option)*9 | 
Class 1.5, Operating range: up to 10m*10 | 
| General | 
| Laser-pointer | 
Coaxial red laser using EDM beam | 
| Levels | 
Graphic | 
6’ (Inner Circle) | 
| Circular level (on tribrach) | 
10’ / 2 mm | 
| Plummet | 
Optical*11 | 
Optional | 
Standard | 
| Laser*12 | 
Standard | 
Optional | 
| Dust and water protection / Operating temperature | 
IP66 (IEC 60529:2001) / -20 to +60ºC (-4 to +140ºF) | 
| Size with handle | 
183(W)x 181(D)x 348(H)mm | 
183(W)x 174(D)x 348(H)mm | 
| (On both faces) | 
(On single face) | 
| Instrument height | 
192.5mm from tribrach mounting surface | 
| Weight with battery & tribrach | 
Approx. 5.1kg (11.3lb) | 
| Power Supply | 
| Battery | 
Li-ion rechargeable battery BDC46C | 
| Operating time (20ºC)*13 | 
Approx. 14hours*14 |