ACEGMETGas Detector, 4 Gas Monitor Multiple Indicator (Vibration, Audible, Visual) H2S, O2, CO and LEL 4 Gas Monitor Personal Rechargeable 4 Gas Meter 2 Years of Sensor Life Gas Sniffer

Within half a day they responded to my request for the calibration certificate. It has the serial number of the unit, date of test, name of the Q/A Engineer, and states it passed the test according to JJF1059.1 - 2012. It took a few minutes to figure out how to submit my request, but the process worked. In terms of the device, there are plenty of reviews on here. It looks like a quality instrument to me. It came fully charged and ready to operate. I did a simple test of the LEL, CO and low O2 detection and they all responded quickly. I have not used it long enough to comment on battery life. Good unit!

You get what you pay for, but it seems to be working fine after a few trips underground. Found a few pockets of black damp and it alerted in seconds. For a basic “throw away” meter, it does the trick.

Part of our equipment for our fire service

Purchased to detect 4 specific gases and it works as described. Works as well as the more expensive units. Using for building walk throughs. Well pleased.

Easy to use gas detection monitor. The display is very easy to read and is accurate. Great product and a great value!

This is a fairly full feature dev board for the RK3568. It is, however, a development board and not a full system. Just because it kindof looks like a raspberry pi, and priced like one, doesn't mean you'll have the same experience - far from it.The major reason Pi is so popular and well used is because of the team's effort in making it easy to use, and making documentation that is superior to every other SBC maker.KickPI is far behind in developer support, but they are focussed on set top boxes and supporting manufacturers who will buy thousands of boards. They are making them available to hobbyists and enthusiasts, but it's not an easy road to travel.The hardware seems solid, I haven't run into any issues yet. They provide enough information to get most people going, but if you want ot use the full potential of this baord you'll need to understand linux device trees, drivers, and more than just compiling a kernel.Note that while this touts its AI unit, it's a very low end unit and not fit for even small language models. 1 Tops falls far short of the 50 TOPs you'd want to run a small language model reasonably quickly. The Raspberry PI AI hat provides 26TOPs for $70, so if you're in this for tops per dollar and have a strong need for AI this isn't it. Adding AI power is easy through USB or PCIE if needed. The onboard AI is meant for easier tasks, and helps offload the processor and GPU, just don't expect it to be an ai powerhouse.The 4k output is ONLY available via HDMI. The other interfaces fall far short of 4k, so if you're imagining a portable 4k tablet or project be aware that the LCD and other interfaces won't suffice, and you will need a 4k HDMI board/chipset in your final solution.The two ethernet ports makes this a fine router, though, and compared to a lot of single board router solutions this is a pretty decent solution. Hopefully someone will measure the throughput in that scenario and provide it to us to compare with mikrotik and other sbc router providers. It should keep up with its 1gbps ports, though, so I don't anticipate any issues with that use.The wifi is real mimo, 2.4 and 5.8GHz, and has two antenna ports - something you won't get from raspberry pi. Using good antennas it should outperform the Pi. It only has software AP mode, though, and shares bluetooth over the same signal path, so if you need an AP you'll want to add hardware, and if you want high performance wifi AND bluetooth I'd recommend a separate bluetooth chipset. For its intended use, though, providing bluetooth and wifi as an end device, this is a great choice, and should be able to handle a lot of data.Again, this is for experienced developers or those with a lot of time and patience. Don't expect to open this up and use it as easily and quickly as a pi, however its price, power, and features edge out the pi in many ways so if you need a little more and have the time or experience then this is a pretty decent sbc.

The gas detector includes a black charging block, a micro USB charging cable, a nozzle, and a manual. It reads multiple gases. When I turn it on, it displays readings for H2S, O2, EX (flammable gases), and CO on its screen. It vibrates during startup and self-checks automatically. The device has a hook and a heavy-duty clip for mounting. I can set both low and high alarms on the detector, so I know when gas levels become dangerous. When I tested it by breathing on the sensor, it immediately alarmed me with low oxygen warnings. I heard a female voice warning me of low oxygen levels, then a loud alarm followed by flashing lights. The detector has a rechargeable battery with a micro USB charging port on top. To use it specifically for testing gas lines, I can attach a nozzle to the front sensor area that clicks into place. This blocks outside air and allows for direct readings from gas sources. I tested the unit near a gas tank, and it immediately detected flammable gas.

Unfortunately in the world of gas detectors, I believe you get what you pay for. This thing does not work, period. I've tried several times (following the correct start-up calibration and all that) to have it detect anything. It never registers anything above the calibrated level. I don't have a dog's nose... when I can easily detect significant smell either from propane leakage or septic, and it's pervasive (like my entire back patio or side yard), any gas detector should be able to detect it as well. These tools are for detecting what humans cannot detect for safety purposes. If it cannot detect even what I can smell, then it's utterly useless and worthless. This foreign made and 10x rebranded "tech" is garbage. I will have to bite the bullet and pay the price for a real detector.