OTC Belt Tension Gauge 6673 — Universal dual-scale (ft·lb / N·m), color readout, handheld

OTC 6673 Universal Belt Tension Gauge is a handheld dual-scale tool that measures drive-belt tension quickly and accurately to match manufacturer specs.

Keeping belt tension within the correct range prevents premature wear and reduces stress on driven accessories and bearings. The OTC 6673 provides a clear, full-color dual readout in both foot-pounds and newton-meters so you can set tension to European or domestic specifications without math. Built from premium materials and precision castings, this gauge is intended for repeated use on automotive, motorcycle, and light industrial belt systems.

How does the OTC 6673 measure belt tension?

The gauge uses a calibrated lever and pointer assembly to deflect a belt by a set amount and display the resulting tension on a dual-colored scale. Readings are direct, so no unit conversion or secondary calculations are required. The physical mechanism is tuned for consistent repeatability under normal shop conditions.

• Calibrated lever and pointer for direct reading
• Dual color scale: 30–180 ft·lb and 130–800 N·m
• Designed for repeatable measurements across multiple belts

What vehicle types and belts is this tool suitable for?

OTC engineered the 6673 to work across a broad range of applications: passenger cars, light trucks, motorcycles, and many industrial belt drives. It handles common V-belts and serpentine-style belts where mechanical tension measurement is required. Always check the vehicle maker’s service data for the recommended tension range before using the gauge.

• Automotive accessory belts on cars and light trucks
• Motorcycle drive belts and smaller industrial drives
• Compatible with most V and multi-rib belt profiles

Why choose a dual-scale gauge instead of a single-unit tool?

A dual-scale eliminates the need for conversions between imperial and metric specs, saving time and reducing error when working with European or British manufacturers’ values. The full-color layout improves visibility in dim shop lighting and speeds checks during diagnostics. This is especially useful in multi-brand shops that service vehicles with mixed specification systems.

• No conversion required: reads directly in ft·lb and N·m
• Color-coded scale improves legibility under shop lighting
• Simplifies service across vehicles with different unit systems

How durable and accurate is the OTC 6673 over time?

OTC builds the 6673 from premium materials and precision castings, assembled to maintain calibration and withstand regular shop use. The construction minimizes drift and mechanical wear so readings remain reliable with normal care. For best results, store the gauge in a dry location and avoid impacts that could alter the calibrated lever geometry.

• Precision cast components for long-term stability
• Robust assembly resists common shop stresses
• Simple care preserves accuracy between recalibrations

Who is this for: The OTC 6673 is aimed at automotive technicians, motorcycle mechanics, service shops, and maintenance teams that need a straightforward, accurate tension-check tool. It’s useful for pros who service a mix of domestic and European vehicles and for industrial maintenance personnel who require reliable, repeatable belt tension measurements to extend component life and reduce downtime.