Electronic cant feedback within the sight picture
The MARCOOL HY3520 is a compact electronic scope level and digital anti-cant tool for precision rifle setups. It provides clear visual feedback so the shooter can identify rifle cant and make a correction without looking away from the sight picture.
Unlike a mechanical bubble level that must be checked separately, the HY3520 places electronic level information where it can be monitored during setup and use. Its fixed 1.0-degree sensitivity provides a defined reference for maintaining a consistent rifle position.
Two operating modes
Horizon Level Mode supports rail-mounted anti-cant monitoring while the rifle is in use. Electronic Level Mode supports scope-turret levelling during setup. The two modes allow one compact device to cover both live cant awareness and optic-alignment tasks.
Automatic orientation for flexible mounting
The display automatically adapts when the unit is mounted horizontally, vertically or in an inverted position. This gives the user more freedom to place the electronic rifle level around the available Picatinny rail space while retaining a readable indication.
Three-level OLED brightness control
Three selectable OLED brightness levels allow the display intensity to be adjusted for changing viewing conditions. Choose the level that keeps the indication visible without making the display unnecessarily bright.
Compact Picatinny rail installation
Measuring 40 x 24 x 15 mm, the HY3520 is designed to add electronic anti-cant feedback without occupying excessive rail space. The supplied clamp secures the unit to a compatible Picatinny rail.
Rechargeable power
The electronic scope level uses a rechargeable lithium-ion battery. A charging cable is supplied for routine charging between sessions.
Technical specifications
| Specification |
Value |
| Brand |
MARCOOL |
| Model |
HY3520 |
| Product type |
Electronic scope level / digital anti-cant tool |
| Sensitivity |
Fixed 1.0 degrees |
| Operating modes |
Horizon Level Mode; Electronic Level Mode |
| Display |
OLED |
| Brightness |
Three selectable levels |
| Orientation |
Automatic adaptation for horizontal, vertical and inverted mounting |
| Mounting interface |
Picatinny rail |
| Dimensions |
40 x 24 x 15 mm |
| Power |
Rechargeable lithium-ion battery |
Package contents
- MARCOOL HY3520 electronic scope level
- Mounting clamp
- Charging cable
Use and care
- Install the unit on a compatible Picatinny rail using the supplied clamp.
- Select the operating mode and OLED brightness level required for the current setup.
- Follow the official MARCOOL manual for installation, operation and charging.
- Check that the unit is secure and displaying the expected orientation before use.
Frequently asked questions
What does the MARCOOL HY3520 do?
It provides electronic visual feedback that helps the shooter identify rifle cant while maintaining the sight picture.
What sensitivity does it use?
The HY3520 has a fixed sensitivity of 1.0 degrees.
Which mounting positions are supported?
The display automatically adapts for horizontal, vertical and inverted mounting positions.
What are the two operating modes?
Horizon Level Mode is used for rail-mounted anti-cant monitoring, while Electronic Level Mode supports scope-turret levelling during setup.
How is it mounted?
The unit mounts to a compatible Picatinny rail using the supplied clamp.
How is it powered?
It uses a rechargeable lithium-ion battery, and a charging cable is included.
What is included?
The package contains the HY3520 electronic scope level, a mounting clamp and a charging cable.
