Mitutoyo 982-551 Contact Tachometer 1-25000 Rpm

Product Description

The MITUTOYO 982-551 is a contact tachometer designed to measure rotational speed from 1 to 25,000 RPM. It delivers two accuracy tiers: 0.006 plus or minus 0.5 percent per digit in the 600 to 25,000 RPM range, and 0.4 plus or minus 1 percent per digit in the 1 to 599.9 RPM range. The unit measures 4.82 inches long by 2.52 inches wide by 1.24 inches thick and runs on three AA batteries, which are included. HVAC technicians, mechanical contractors, and maintenance professionals use this instrument to verify motor shaft speed, blower RPM, and other rotating equipment during commissioning and service calls.

The 982-551 suits residential and commercial service work where a portable, handheld tachometer is needed for quick on-site RPM verification. It is well suited for motor speed checks on HVAC blower assemblies, fan drives, pump shafts, and similar rotating components. The contact measurement method provides a direct mechanical reading by touching the probe tip to a rotating shaft or spindle, making it useful in field conditions where non-contact optical measurement is not practical.

Key Features

• Measurement range: 1 to 25,000 RPM via direct contact method
• High-range accuracy: 0.006 plus or minus 0.5 percent per digit from 600 to 25,000 RPM
• Low-range accuracy: 0.4 plus or minus 1 percent per digit from 1 to 599.9 RPM
• Compact form factor: 4.82 inches long by 2.52 inches wide by 1.24 inches thick
• Powered by three AA batteries, included in the package
• Minimum measurable speed of 1.0 RPM supports low-speed shaft verification

Compatibility

Designed as a general-purpose handheld contact tachometer for field and shop use on rotating shafts and spindles across HVAC, mechanical, and industrial service applications.

Installation Notes

This instrument is a handheld measuring device and does not require permanent installation. Before taking a reading, ensure the rotating equipment is operating at a stable speed and that all guards removed for access are replaced after measurement. Use the appropriate probe tip for the shaft diameter being measured to ensure consistent contact and accurate readings. Technicians should follow applicable OSHA and site safety procedures when working near rotating machinery.