The ultimate drainage grader, featuring variable grade vials for dramatically improved work efficiency.
Frame
- Box-type frame with U-groove
- U-groove for measuring Hume pipes and VU pipes (φ19 and larger)
- Scale graduations
- Aluminum surface treatment
- Heat-hardened extrusion
AIR BUBBLES TUBE
- Horizontal/gradient gauge vial: Block-type resin vial
- Vertical vial: Tubular resin vial
- 4 graduations
- Sensitivity: 0.5 mm/m = 0.0286°
- Accuracy: ±1.50 mm/m = ±0.0859°

GL-25U-02/ GL-25U-03
Slope rating table for the GL-25U, GL-15U, and GL-35U series of slope gauges from one manufacturer. These instruments are specifically designed to measure the drainage slope of pipes (e.g., concrete sewer pipes, PVC pipes).
Specifications
The table shows various slope ratings and their corresponding values in centimeters per meter (cm/m).
Product Code Size Slope Ratio Value (cm/m) Measuring Direction
GL-25U 300mm 1/50, 1/100, 1/150 2cm/1m, 1cm/1m, 0.67cm/1m Horizontal
GL-25U 500mm 1/50, 1/100, 1/150, 1/200 2cm/1m, 1cm/1m, 0.67cm/1m, 0.5cm/1m Horizontal, Vertical
GL-15U 500mm 1/25, 1/33, 1/50, 1/75 4cm/1m, 3cm/1m, 2cm/1m, 1.33cm/1m Horizontal, Vertical
GL-35U 500mm 1/200, 1/300, 1/400, 1/500 0.5cm/1m, 0.33cm/1m, 0.25cm/1m, 0.2cm/1m Horizontal, Vertical
These tools simplify the precise setting of slopes on the job site by providing pre-set slope levels on the level tube.
Specifications
The table shows various slope ratings and their corresponding values in centimeters per meter (cm/m).
Product Code Size Slope Ratio Value (cm/m) Measuring Direction
GL-25U 300mm 1/50, 1/100, 1/150 2cm/1m, 1cm/1m, 0.67cm/1m Horizontal
GL-25U 500mm 1/50, 1/100, 1/150, 1/200 2cm/1m, 1cm/1m, 0.67cm/1m, 0.5cm/1m Horizontal, Vertical
GL-15U 500mm 1/25, 1/33, 1/50, 1/75 4cm/1m, 3cm/1m, 2cm/1m, 1.33cm/1m Horizontal, Vertical
GL-35U 500mm 1/200, 1/300, 1/400, 1/500 0.5cm/1m, 0.33cm/1m, 0.25cm/1m, 0.2cm/1m Horizontal, Vertical
These tools simplify the precise setting of slopes on the job site by providing pre-set slope levels on the level tube.



- Calibration certificate available
Custom Order Examples
Non-standard sizes (e.g., 1M) can also be manufactured.
Custom gradient settings are also available for the GL-25U, GL-15U, and GL-35U.
For example, we can change the 1/200 gradient of the GL-25U 500mm to a 1/250 gradient. (Separate quote required.)
Non-standard sizes (e.g., 1M) can also be manufactured.
Custom gradient settings are also available for the GL-25U, GL-15U, and GL-35U.
For example, we can change the 1/200 gradient of the GL-25U 500mm to a 1/250 gradient. (Separate quote required.)



















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