Professional Internal and External Right-Angle Gauge | Inside and Outside Corner Gauge with 270° Rotating Joint | High-Precision Home Renovation and Inspection Tool | 130mm Multifunctional Leveling Gauge

🛠️ The “Standard” for Professional Renovation and Home Inspection — Inside and Outside Right-Angle Gauge
Whether you’re a professional renovator or a homeowner inspecting a new home, precise angle measurement is key to ensuring construction quality. This multifunctional inside and outside right-angle gauge (inside/outside corner gauge) combines right-angle verification, level measurement, and angle deviation readings into one indispensable professional tool.

✨ Key Features (Why Choose Us)
✅ Dual Measurement for Internal and External Angles—Two Functions in One Ruler:
The unique hinged design effortlessly handles both internal (concave) and external (convex) angle inspections. Whether it’s wall corners or tile joints, this single ruler handles it all.

✅ High-Precision Scale with Millimeter-Level Readings:
Equipped with a professional scale, the value indicated by the pointer corresponds to the right-angle deviation over a 130mm length of the surface being measured. Each division is accurate to 1 mm, leaving no room for error.

✅ 270° Free Rotation for Flexible Adaptability:
The adjustable ruler supports a wide 270° rotation range to meet the needs of various measurement scenarios. (Note: Be sure to rotate it 270° and lock it in place before taking measurements.)

✅ Built-in Level Bubble for Hassle-Free Calibration:
A high-sensitivity spirit level is built into the main ruler’s cap, allowing not only for verticality measurement but also for horizontal calibration—a versatile tool that saves you the hassle.

✅ Premium Materials, Sturdy and Durable:
The main ruler body is made of aluminum alloy, which is wear-resistant and rust-proof; the ABS engineering plastic handle provides a comfortable grip; and the precision rotating shaft and pressure pin design ensure it remains secure even with long-term use.

📐 Measurement Principle and Instructions (How It Works)
Measurement Principle: The value indicated by the pointer on the scale represents the deviation from a right angle over a 130 mm length of the surface being measured (1 mm per division).
Instructions:

Open: Push the locking pin to extend the ruler body.

Extend: Pull the movable ruler out to the desired angle.

Rotate: Be sure to rotate the movable ruler 270° until it clicks into place (otherwise, it will not measure properly).

Measure: Place the ruler against the corner being measured and observe the pointer on the scale to read the deviation value.

🏗️ Wide Range of Applications (Wide Application)
Tile Installation: Check whether the inside and outside corners of wall and floor tiles are vertical and level.

Wall Inspection: Check whether wall corners meet standards during home inspections.

Carpentry: Calibrate right angles for furniture assembly and cutting panels.

Plumbing and Electrical Installation: Check the angles and levelness of pipe installations.

📦 Product Specifications
Product Name: Internal and External Right-Angle Gauge (Internal/External Corner Gauge)

Measuring Range: Internal/External Angles, 130mm Scale

Scale Accuracy: 1mm per division

Rotation Angle: 270°

Main Materials: Aluminum alloy ruler body + ABS plastic handle

Functions: Right-angle verification, level verification, deviation readings

❓ Frequently Asked Questions  
Q1: Why won’t the pointer move or why can’t I take a measurement?
A: Please check if the movable ruler has been rotated 270° and locked in place. The pointer will only function once it is fully rotated into position.

Q2: How long of a right angle can this ruler measure?
A: The main ruler’s measuring surface is 130 mm long, and the scale displays the right-angle deviation within this 130 mm length. If you need to measure longer distances, we recommend measuring in sections or using a laser level.

Q3: What should I do if the pointer becomes inaccurate after the ruler is dropped?
A: It features a calibration design! There is a calibrable bubble inside the main ruler’s cap, and the screw above the pressure pin allows for fine-tuning to reset the pointer to zero, making it easy for you to maintain it yourself.