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www.johnsonlevel.com/manuals

We want to get you up and running as quickly as possible - but this quick start guide is not a replacement for reading and understanding your  

operator’s manual! For complete safety & operating instructions, refer to the operator’s manual included with your tool or scan the QR code.

TROUBLESHOOTING: “Erro” MESSAGE

If this digital level is tilted past approximately 30° forward or 

backward (in the non-operational direction), “Erro” will be displayed 

on the screen. To return to normal operation, bring the level back to 

within 30° of its standard operating position. 

CALIBRATION PROCEDURE

Calibration is quick and easy, and is the best way to ensure your 

level is reading consistently every time you use it. We recommend 

calibrating at the start of each critical job, or when the level is 

subjected to drastic changes in temperature (such as going from a 

cold car to a warm jobsite). 

To calibrate your digital level:
1.  Place the level against a wall so that the bubble in the horizontal 

vial is in the center of the two indicator marks and the LCD is 

facing you. 

2.  With the level powered ON, press and hold 

 for three 

seconds. 

3.  The LCD will flash “CAL” while calibration is in progress. 
4.  If calibration is successful, the LCD will briefly indicate “rdy” and  

return to normal operation. 

5.  If the level fails to calibrate, it will display “Erro” after the 

calibration process. If this happens, repeat the calibration 

procedure. The most common  reasons the level will fail to 

calibrate include:

CALIBRATION POSITION

Reference mode temporarily sets the digital level’s current reading to 

zero without changing the calibration of the digital level. 

Reference mode is ideal to speed up your work in a variety of 

scenarios: 

1. When taking repeat measurements, such as checking multiple 

ramps for ADA compliance, setting a consistent drainage slope, or 

adjusting concrete formwork at multiple points, reference mode can 

be used to make the desired target “zero”. Then, a reading of “zero” 

in reference mode means you have achieved your desired slope.  

2. When trying to find the difference between two slopes, reference 

mode can eliminate the mathematics and simplify the task. Set the 

level on the first slope, enable reference mode, and read your second 

slope. The displayed value is the difference between the angles. 

3. When trying to find a relative angle on an unlevel surface, such as 

setting a blade angle on a saw that is setting on non-level ground, 

reference mode can compensate for the angle of the ground. Using 

reference mode, you can set the blade angle directly without the 

need to compensate for the non-level ground.

To enter reference mode, press 

. The digital level will set the 

current measurement to “0.0” or “0 in/ft”, and all measured angles 

will be relative to this setpoint. 

To exit reference mode and return to normal operation, press 

.

SETTING A ZERO REFERENCE

•  Moving the level during calibration
•  The level is too far from its factory zero-point (not leveled) 

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