Model DL-101C DL-102C Telescope Magnification 32× 30× Objective Aperture 45mm Field of View 1°20′ Resolving power 3″ Compensator Working Range ±12′ ±15′ Setting Accuracy ±0.3″ ±0.5″ Height Measurement Accuracy (Standard deviation for 1km double-run levelling) Electronic reading 0.4mm w/Invar staff 1.0mm w/Fiberglass staff Optical reading 1.0mm 1.5mm Least Count 0.1mm / 0.01mm (0.001ft / 0.0001ft) 1mm / 0.1mm (0.01ft / 0.001ft) Distance Measurement Least Count 1cm / 1mm 1cm Accuracy 1cm to 5cm Measuring Range 2m to 100m (7ft to 328ft): Fiberglass staff / Aluminium staff 2m to 60m(7ft to 197ft): Invar staff Measuring Time 3 sec. Circular Level Sensitivity 8′/2m 10′/2m Others Display 2-line, 8-digit per line. Dot matrix LCD with backlight Data Storage PCMCIA card (64KB to 2MB) Internal memory approx. 8,000 data Data Transmission RS-232C port provided Keyboard Alphanumeric input Timer Built-in-timer Horizontal Circle 360° or 400gon Power Supply AA size dry cell batteries × 6 [Option: Rechargeable Battery BT-31Q] Operating Time 10 hours (Dry cell - Alkaline) [10 hours (BT-31Q Rechargeable Battery)] Ambient Temperature Range -20°C to +50°C [-4°F to +122°F] Dimensions 237 × 196 × 141mm [9.33 × 7.72 × 5.55inch] Weight 2.8kg[6.16 lbs] (including on-board battery) Data Card PC card based on PCMCIA (SRAM: 64K to 2M byte) Staff Aluminum staff SA-5M Length: 5.0m[16.40ft] (Slide Type: 3pcs.) Fiberglass staff SG-3M Length: 3.0m[9.84ft] (1.5m[4.92ft] × 2 pcs.) Graduation: 1cm graduation with 5mm pattern (front surface) Invar staff SI-3/T or SI-3 Length: 3.0m[9.84ft]