Extech 461995 Combination Contact/Laser Photo Tachometer
The Extech Combination Contact/Laser Photo Tachometer makes laser-guided non-contact measurements.
Features
- Accurate to 0.05% with max resolution of 0.1rpm
- Microprocessor based with quartz crystal oscillatorto maintain high accuracy
- Tachometer memory stores last max and min readings
- Free ground shipping
- Expedited repair and warranty service
- Lifetime technical support
- More
The Extech Combination Contact/Laser Photo Tachometer features a unique display where characters reverse direction depending on measurement mode selected. The narrow beam laser provides accurate non-contact RPM measurements from up to 6.5 feet from the target for improved safety and accessibility.
- Photo mode range: 10 to 99,999rpm
- Contact mode range: 0.5 to 20,000rpm
- Resolution: 0.1rpm (< 1,000 rpm); 1rpm (>1000rpm)
- Accuracy: 0.05% rdg +1 digit
- Photo mode sampling time: 1 sec> 60rpm
- Contact mode sampling time: 1 sec> 6rpm
- Contact mode surface speed: 0.2 to 6560ft/min, 0.05 to 1999.9m/min
- Power: 4 AA batteries
- Dimensions: 8.5 x 2.6 x 1.5 (215 x 65 x 38 mm)
- Weight: 10.6 oz (300 g)
- Warranty: 1 year
- (1) L
- (1) Cone tip
- (1) Flat tip
- (1) Spare wheel
- (4) 1.5V AA batteries
- (1) Carrying case
In The News
A Drop in the Ocean: Restoring London’s Tidal Thames
The United Kingdom has grappled with wastewater management problems for decades. Although sewage treatment in the 20th century allowed many rivers, including the tidal Thames, to have healthy fish populations, combined sewer overflows into rivers–most commonly during heavy rainfall–affected water quality and occasionally even killed fish. 
 
Problems reached a head in 2012 when multiple infractions of European urban wastewater treatment laws threatened costly fines, on top of the environmental cost of repeated sewage spills into British rivers. 
 
Fast forward to 2025, and after a decade of construction work, London’s Thames Tideway Tunnel , affectionately dubbed the “super sewer”, is now fully activated and ready for testing.
Read MoreHave You Heard? AI Buoys Revolutionizing Marine Mammal Monitoring in Whangārei Harbor, New Zealand
In one history, Whangārei Harbor, nestled in the lush hills of New Zealand’s North Island, gets its name from the Māori, “waiting for the breastbone of the whale.” It seems fitting, then, that it’s now home to state-of-the-art acoustic monitoring buoys listening for marine mammals around the clock. 
 
In September 2024, a team from Auckland-based underwater acoustics firm Cetaware Ltd installed NexSens buoys in Northport, a major commercial port at the entrance to the Whangārei Harbor. 
 
The first buoys to be installed by Cetaware in a permanent setting running 24/7, they use real-time artificial intelligence (AI) models to passively sense Delphinidae–from common dolphins to orcas. 
 
Dr.
Read MoreWildfires and Wildlife: Relocating Coastal Rainbow Trout to the Arroyo Seco Stream
Human interaction has negatively impacted the hundreds of streams that run through Southern California. Man-made river and stream diversions, channeling, and damming have changed the physical and chemical characteristics of these waterways. In addition to physical impairments, climate change is increasingly impacting the ecosystems of streams. 
 
To evaluate and mitigate these negative impacts, local groups are monitoring the riparian habitats of these streams and are conducting water surveys that document rainbow trout populations and evaluate water quality .
Read More