Hydrogen Sulfide Detector H₂S Monitor 0~100ppm Electrochemical H₂S Sensor LED Alarm with LCD Screen Backlight Portable Tester

Instructions are clear for set up.Effiicient reading of CO2 levels, responding to ventilation changes quickly.

We tried a couple of models of CO2 monitors and chose this one because it’s easy for any of the staff to read and an unobtrusive alarm goes off when CO2 reaches 1000ppm. Easy to position, decent power cable length. Instructions aren’t particularly easy to follow but we got there - worth reading carefully to get the calibration correct - ie do outdoors or switch it off. It’s great to know when it’s time to increase ventilation and comforting to know when CO2 levels are fine.

It is important to know carbon dioxide levels and it is believed that there is a relationship between keeping levels at or below the norm and removal of coronavirus which during the current pandemic has a value of its own. The GainExpress monitor also claims to accurately monitor temperature and relative humidity which is important not only for human health but for safeguarding furnishings, books and other home belongings .

I like the audible alarm which alerts us to dangerous gas leaks, really an essential item in beer cellars. Easy to set up.

Good product, serves its purpose well. The calibration function is a little tricky, asks you to calibrate outside, but it’s mains operated only, no battery’s. So have to move a power outlet close to an exterior window. Very sensitive to changes in CO2, which is perfect for monitoring purposes.

Plug in and get instant results, safely packaged and arrived promptly

Plugged in and works and sounds an alarm when levelks raise too high.

Excellent product out of the box . Using it daily to monitor co2 levels in physio practiceHighly recommend . Very sensitive

Trying to contact seller to see if I can get Clíp/ carry case that it should come with

Impossible de mettre l’alerte sonore de niveau CO2 à off. Elle Sonnera en pleine nuit si le niveau de CO2 augmente !?

Excellent produit avec une mesure fiable. Dehors il indique bien une valeur entre 350 et 450 ppm ce qui est normal . Dedans il augmente en fonction du nombre de personnes souvent au dessus de 1000 en ouvrant fenêtres ou portes ça baisse de suite. Le matin dans le salon lecture à 700 car il n'y avait personne puis augmentation en fonction du nombres de personnes. Je trouve cet appareil au niveau mesures fiable, pas besoin de piles. La notice est en Anglais mais ne pose aucun problème on comprend facilement. Il est cher comparé aux autres mais le prix des instruments de mesure dépend de la qualité des capteurs plus c'est économique plus le capteur manquera de precision. Ceci explique cela. Un bon choix .

Lo hemos utilizado en el cole para montar un sistema de control de calidad del aire. Conectado a un extractor nos permite, gracias al relé, automatizar la ventilación en función de la calidad del aire interior.

If you're using this indoors in an office with closed windows, the manual tells you (page 9) to disable the Automatic Baseline Calibration (ABC). ABC adjusts for sensor drift by assuming the monitor sniffs normal air sometime in every 7-day period. Normal air is 400 ppm so it adjusts the baseline accordingly. I wrote the company to see how big a calibration they would apply for IR sensor drift.I love that this meter includes actual, complete specifications, including how quickly the sensor responds to changes in CO2 (see the PDF on their web site):Range: 0~2000 ppm {2001~9999 (out of scale)}Accuracy ±50 ppm ±5% rdg (0~2000)Resolution: 1 ppmSo if I see 1000 on the display, there is 900-1100 ppm in the air. If the air has over 2000 ppm, they're simply not going to be able to guarantee the reading. Since the calibration only goes to 2000 ppm, they warn you not to set the high-CO2 alarm value above 2000.I like that this has the data port for long-term monitoring and a relay port for controlling external equipment. I don't use either, but it's a high-end feature I might if I put up a greenhouse with a CO2 bottle to spur growth. They have higher-end units that are calibrated and accurate over a larger range.It remembers its settings if you power it off. It would be a royal pain to adjust the ABC after any power outage.The buttons let you scroll through 15-minute or 8-hour weighted average readings for CO2 and min/max values. Feels well made. Deep enough to stand on its own.I was subjecting myself to CO2 levels that wouldn't be permissible in a California office building.