swr999 on eBay

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Location: United StatesMember since: Feb 20, 2000

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All feedback (387)

total_parts (4127)- Feedback left by buyer.
More than a year ago
Verified purchase
Good buyer, prompt payment, valued customer, highly recommended.
*****- Feedback left by buyer.
More than a year ago
Verified purchase
Good buyer, prompt payment, valued customer, highly recommended.
cad-stock (10)- Feedback left by buyer.
Past month
Verified purchase
Great communication. A pleasure to do business with.
treasureseekerllc (1023)- Feedback left by buyer.
Past year
Verified purchase
Hope to deal with you again. Thank you.
atto_o (1479)- Feedback left by buyer.
Past year
Verified purchase
Hope to deal with you again. Thank you.
middletown_outdoors (13059)- Feedback left by buyer.
Past year
Verified purchase
Prompt Payment! Great Customer!

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Reviews (12)

1-1/2 INCH GROOVED JAW DRILL PRESS VISE (3900-1730)

Oct 04, 2016

good value for money

It works very well. The outside finish is a bit rough, but the jaws are good. Shipping was relatively fast. Worth the selling price.

4PCS MH-Z16 NDIR Infrared sensor for Teaching agriculture greenhouse CO2 monitor

Aug 18, 2019

A quality CO2 sensor at an economical price point.

This is a compact, well-designed instrument for measuring carbon dioxide (CO2) concentration in air. The sensor can be ordered in several measurement ranges, up to 0-10%. An I/O cable is included. The unit has an easy interface with three options for the output: analog voltage, PWM duty cycle, and digital UART serial communication. I use the UART output to a microcontroller which is easy to implement and works fine. The manual gives a pretty good explanation of how to use the instrument, but could use a bit of editing for english speakers. However, it's enough to get you going. An important point is that the design of this instrument incorporates a dual-wavelength approach, rather than a single-wavelength more typical of lower-priced CO2 sensors. Dual-wavelength is typical of higher-performance analysers, and means that a non-absorbing wavelength is included as a reference wavelength in addition to the CO2-absorbing wavelength. This results in a final measurement which is based on the CO2/Ref ratio rather than on the single CO2-absorbing wavelength alone. The dual-wavelength reduces common mode errors and results in a more stable and accurate measurement. Some years ago I purchased one of these analysers for use in a research project. After several years of storage I got it out again, wired it up to a microcontroller, applied power, and immediately got good CO2 readings which compared well with a laboratory CO2 analyser. In addition to the instrument itself, I have found the manufacturer (Winsen) to be very responsive to questions about the unit. I have worked with infra-red CO2 measurement for a number of years, and from what I have seen I would recommend this analyser as a good instrument at an economical price point.

RALTRON CRYSTAL OSCILLATORS 100 MHZ 3.3VOLT (10 PCS)

Jul 03, 2018

Works as advertised, good value for money.

Works as advertised, oscillates at 100 MHz, sinusoid waveform. Use 3.3 Vcc. Good value for money.

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