Parameter Model

AL-20

AL-24

AL-28

Standard deviation for 1 km double-run levelling

2.5mm

2.0mm

1.5mm

Telescope image

Erect

Erect

Erect

Magnification

20x

24x

28x

Clear Objective Aperture

30mm

36mm

36mm

Field of View

1^o20'

1^o20'

1^o20'

Shortest focusing Distance

0.6m

0.6m

0.6m

Stadia multiplying constant

100

100

100

Stadia Additive Constant

0

0

0

Sensitivity of Circular Level

8'/2mm

8'/2mm

8'/2mm

Graduation Interval of Circle

1^oor 1gon*

1^oor 1gon*

1^oor 1gon*

Compensator type

X-shaped wire suspension air-damping

X-shaped wire suspension air-damping

X-shaped wire suspension air-damping

Working Range

+-15'

+-15'

+-15'

Setting Accuracy

0.5”

0.5”

0.5”

Dimensions

190x130x136mm

190x130x136mm

190x130x136mm

Weight

1.8kg

1.8kg

1.8kg

Connecting size to tripod

M16 or 5/8”

M16 or 5/8”

M16 or 5/8”