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.

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
Specifications: Fluke 931 Contact and Non-Contact Dual-Purpose Tachometers
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
Warranty period 1 year

Models: Fluke 931 Contact and Non-Contact Dual-Purpose Tachometers
0.1 m wheel
Conical speed measuring head
Inner cone speed measuring head
Lengthening rod
10 reflective stripes