The NTS 355 has the benefit of being easy to use with an alpha numeric keypad.

The NTS 355 combines an easy to use system with affordability and accuracy. Has the potential for an EDM unit to be attached to the top and includes the complete NTS Kit. Comes with alpha numeric keypad and is completely waterproof, dust proof and dirt proof. Suitable for use in wet conditions.
Comes with a 2 year warranty
Kit comprises of:

NTS 355
Data download cable
Windows 9X/ME/2000/NT/XP Compatible Software
2m Pole
Wooden Tripod
Plastic Rigid Case
Two Batteries and Charger

Telescope:  
Image:  Erect image 
Magnification:  30x 
Effective aperture:  45mm 
Resolving Power:  4” 
Field of view:  1o 30” 
Minimum:  1.m 
Stadia Ratio:  100 
Sight Distance Precision:  £0.40%D 
Tube Length:  154mm 
Distance Measurement:  
Single Prism:  (Under fair weather conditions) 108Km 
Display  Max: 999999.99m Min: 1mm 
Unit:  M/ft Selectable 
Accuracy:  ± (5mm=5 ppm.D) 
Measuring time:  Fine Single Shot: 6s; Repeated: 3s ;Tracking: 1s 
Average Measuring time:  Average value of 2#5 times 
Meteorological correction:  Manual input, auto correction 
Atmospheric refraction & earth curvature correction:  Manual Input, Auto correction, K=0.14 
Reflection prism correction:  Manual input, Auto correction 
Angle Measurement:  
Angle Measurement Mode:  Photoelectric detection by incremental encoder 
Dia of circle (vertical, horizontal):  79mm 
Minimum reading:  1” / 5” Selectable 
Detection method  Horizontal: Dual Vertical: Dual 
Measurement unit:  360o /400gon /6400mil selectable 
Vertical angle: 0o  Zenith 0o /Horizontal 0o / selectable 
Accuracy:  5” 
Levelling vial:  
Sensitivity of plate vial: (/2mm)  30” /2mm 
Sensitivity of circular vial:  8’ /2m 
Vertical compensatory : 
System:  Liquid-electric detection plat/vial 
Compensation range:  ±3’ 
Resolving power:  1” 
Optical Plummet:  
Image:  Erect Image 
Magnification:  3x 
Focusing range:  0.5~µ 
Field of view:  5o 
Display:  
Type:  LCD, Four lines, digital 
Data communication:  
Port:  RS-232C 
On-board battery : 
Power source:  Rechargeable Ni-H battery 
Voltage:  DC6V 
Operating time:  NB-10A 205hrs NB-20A 8hrs 
Working environment:  
Working temperature:  -20o~+45o