The Fluke 931 tachometer is a handheld tachometer, which integrates the contact and non-contact speed measurement functions and can accurately measure the revolutions per minute (RPM) or surface speed and distance. Fluke 930 is equivalent to a Fluke 931 with minimum configuration. With only the non-contact measuring function provided, it's more affordable and offers consistent quality.

Key Features:

6-digit backlight display reads the data clearly
Signal detection reminder avoids invalid detection actions
Maximum/minimum/average value and final readings
Setting/Turning off the automatic power-off function
Small size and easy to hold
Easy switching of the contact and non-contact measurement modes
Different speed measuring heads and rotational speeds adapt to different measurement occasions

Specifications:

Rotation speed measurement
Range	Optical (non-contact) measurement: 1 to 99999 revolutions/minute Contact measurement: 1 to 19999 revolutions/minute (Fluke 931 only)
Precision	±0.02%RD+1
Sensing distance	(optical) 500 mm

Specifications
Battery type	(2) 1.5V LR6 (alkaline) AA battery
Battery life	About 40 hours
Operating temperature	0°C to 50°C
Storage temperature	-20°C to 70°C
Weight	250 g
Dimensions	175 × 60 × 28 mm

Applications:

Heavy manufacturing environments, e.g. automotive, textile, pulp and paper, metalwork
Water purification plants
Machining and chemical manufacturing plants
HVAC compressors for industrial systems