Johnson Level 40-6902 User Manual

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22X Builder’s Level

Model No. 40-6900

Instruction Manual

Congratulations on your choice of this 22X Builder’s Level. We suggest you read this instruction manual thoroughly before using the instrument. Save this instruction manual for future use.

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Table of Contents

1. Kit Contents

2. Features and Functions

3. Location of Parts/Components

4. Operating Instructions

5. Calibration

6. Technical Specifications

7. Care and Handling

8. Product Warranty

9. Product Registration

10. Accessories

1. Kit Contents

Description Qty.

22X Builder’s Level 1 Instruction Manual with Warranty Card 1 Hard Shell Carrying Case 1

2. Features and Functions

• Horizontal Circle - Graduated to single degrees and reads by vernier direct to 15 minutes

• Horizontal Tangent Screw - For precise movement control.

• Built-in Sunshade - For clear sighting

• Top Mounted Leveling Vial - For effortless viewing

• Large Leveling Screws - Easy to turn

• Versatile - Ideal for leveling foundations, driveways, patios, floors, for grading street, curbs ditches for aligning fences; or any other light construction job.

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3. Location of Part/Components

Leveling Vial

Focusing Knob

Horizontal Vernier

Horizontal Tangent Knob

Horizontal Graduated Circle

Base

Eyepiece

Telescope Objective Lens

Leveling Screw

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4. Operating Instructions

IMPORTANT: It is the responsibility of the user to verify the

calibration of the instrument before each use.

Set-Up the instrument on the tripod

When setting up the tripod, make sure the three tripod points are firmly into the ground and the top of the tripod head is as level as possible. Adjust the height of the tripod to a comfortable viewing height, secure the retractable legs. Attach the instrument to the tripod head with the center screw and tighten securely as shown in figure 3.

Leveling

Mount the instrument on the tripod and line up the telescope vial in position #1 as sho Then grasp screws A & B so that both thumbs are moving in opposite directions, either toward each other or away from each other. Note that the bubble moves in the same direction as your left thumb.

wn.

and

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Keep about half the length engaged. When the bubble is centered in position #1, turn the instrument and observe the vial in position #2. Now center the bubble in position #2 using only screw C. The instrument should now be leveled, but to be certain, double-check. Rotate the instrument 180º so the vial is reversed. If the bubble will not center when reversed, follow adjustment procedure outlined under “Bubble Adjustments.”

Aiming and Focusing

Rotate the instrument by hand to aim the telescope to the far object.

te the focusing knob until the object can be observed clearly.

Rota Rotate the horizontal tangent knob, to place the vertical cross hairs on the object.

Reading the Vernier

The vernier is actually a double

, that is, two verniers in

vernier one. This makes it possible to read any angle turned by the telescope, whether to the right or to the left. For example, consider that you have turned an angle to the left (counterclockwise) after first having set the circle to read 0º. Refer to the bottom figure, this is what your vernier looks like after having turned the angle.

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