1. Measurement Capabilities: This Non-Contact, Photo-Type Tachometer Measures Rotational Speeds From 60 To 100,000 RPM At A Measuring Distance Of 75 To 300 Mm (3 To 12 Inches), Delivering An Accuracy Of Plus Or Minus 0.05% Plus 1 Digit.

1. Measurement Capabilities: This Contact-Type Tachometer Measures Rotational Speeds From 60 To 50,000 RPM And Surface Speeds From 6 To 5,000 Meters Per Minute, Providing An Accuracy Of 0.05% Plus 1 Digit.

* Measurement Capabilities: Offers A Non-Contact Measurement Range Of 10 To 99999 Rpm And A Contact Measurement Range Of 1.0 To 19999 Rpm[1][2]. It Measures Contact Rotation Speed And Contact Linear Speed With An Effective Non-Contact Sensing Distance Of 50mm To 500mm[1][2].

1. Measurement Capabilities: It Is A 2-In-1 Contact And Non-Contact Digital Tachometer That Measures Rotational Speed (Up To 99,999 RPM For Non-Contact And 20,000 RPM For Contact), Frequency, And Surface Velocity.

1. Measurement Capabilities: The DT-2230 Is A 2-In-1 Instrument That Measures Rotational Speed From 5 To 99,999 RPM Using The Photo Tachometer And 0.5 To 19,999 RPM Using The Contact Tachometer, As Well As Surface Speed In Meters Per Minute And Feet Per Minute.