I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806
Extech AN100 CFM / CMM Thermo-Anemometer New in Box - Factory Warranty Large Display of Airflow or Air Velocity CFM/CMM Thermo-Anemometer Simultaneous Display of Ambient Temperature and Air Flow or Air Velocity Up to 8 Easy to Set Area Dimensions are Stored in the Meter's Internal Memory of Each Unit 20 Point Average Function for Air Flow Super Large LCD Backlit Display 3% Velocity Accuracy via Low Friction 2.83"D (72mm) Ball Bearing Vane
Code: XXX Shipping: Canada: $60.89 Worldwide: $49.89 (I do NOT ship to Mainland China, South Korea, North Korea, Brazil). Southeast Asia buyers - See the bottom for delivery times!!!! No Reserve.
Greetings! This 2440 is used and in superb condition. The display processor output and attenuator caps have been tuned to factory specification, and it has been calibrated with a DMM and power supply that both have NIST-traceable calibrations in a lab environment.
Greetings! This 2430A is used and in superb condition. The display processor output and attenuator caps have been tuned to factory specification, and it has been calibrated with a DMM and power supply that both have NIST-traceable calibrations in a lab environment.
8568B Spectrum Analyzer 8568B Spectrum Analyzer Here is a very nice HP 8568B Spectrum Analyzer. It has been cleaned, serviced and thoroughly checked out. It is in excellent working condition.
The Reliable, Repeatable, Accurate Way to Check Bearings and Overall Vibration Make go or no-go maintenance decisions with confidence. The Fluke 805 Vibration
A 2-part repair composite for metal repair and resurfacing based on solvent free epoxy resin reinforced with silicon steel alloy. This repair material will not corrode and resists a wide range of chemicals. It is easy to mix and apply without the need of specialist tools and can be machined using conventional tools.
Used for 2 days on a job. Model # AM2560 This newly designed RIDGID Model AM2560 Air Mover is designed for Pros and DIYers who want high-volume air movement. The 3-speed heavy-duty induction motor provides 1625 CFM with less vibration and noise.
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