Johnson Level & Tool Mfg. 40-6660 - Manual (Page 17)

©2007 Johnson Level & Tool 17
6. Observe whether the downside of V1
coincides with the standard plumb
line or not. If not, and the deviation
exceeds 0.039" (1mm), then V1
line's vertical accuracy e is beyond
tolerance (Fig.12).
NOTE: During the observation, make
sure that your viewing is against the
laser line and the standard plumb line.
7. Follow the same method to check the accuracy of V2.
8. If the self-checked accuracy is beyond tolerance,
reference section 12 of this document.
9. Technical Specifications
Laser Wavelength 635nm±10nm
Laser Classification Class IIIa
Maximum Power Output
≤5mW
Accuracy ±3/8"/100 ft. (±3mm/10m)
Working Range Maximum 100 ft. (30m) depending upon
light conditions
Measuring Range 131 ft. (40m) radius with detector
Self-leveling Range ±3.5° with laser flashing and sound
alarm when out of tolerance
Power Supply Rechargeable battery pack or battery
adapter
Dimensions 5-1/2" x 5" x 7" (140 x 125 x 180mm)
Weight 9.39 lbs (4.25 Kg)
Working Temperature 14°F to 113°F (-10°C to +40° C)
Center Screw Thread 5/8" – 11; 1/4" –20
Plummet
V1