MEXTECH Multi Stem Thermometer, ST9283B, White

Good Heat Sensitivity with accuracy Rage is High as compared to another in this price

Very bad experience

Nothing to appreciate, defective piece supplied.. display shows some letters but not 'temperature' which it is supposed to show..waste of time supplier..

Bought this digital thermometer for film development work. For film development, chemical temperatures need to be very accurate. To test the accuracy of this thermometer, I did a very simple boiling water temperature reading test and compared it against an accurate MIG (mercury in glass) thermometer which has a temperature reading range of -10 degree C to +250 degree C.1. Quick measurement.Getting temperature readings of development chemicals quickly will allow me to be more precise with my film development and therefore avoid errors. The packaging and product listing page describes "Quick Measurement" as a feature of this thermometer. However, I found that the thermometer took more time than a classic MIG thermometer to provide accurate and stable temperature readings in multiple boiling water tests. Many times, the thermometer would just constantly fluctuate 3 or 4 degrees C, which I will discuss shortly.2. Ease of useYes I have a complaint about the ease of use of this thermometer. It's too easy to use. Okay, yeah, I am not paying a lot of money for this thermometer. it is very cheap. But it looks less like a professional tool and more like a toy made for 8 year old science enthusiasts. On a thermometer that is marketed towards professionals, I expect to see some professional controls and rugged build quality which I will discuss later. The control buttons don't feel tactile at all. There is no "click" or even a slight feeling of response that you expect to get when you have pressed a button. Sometimes I turn the thing on and off immediately thinking I didn't press the key properly the first time. Unintentional double button presses also happen when setting the alarms. The LCD screen is also a cheap one, even worse than you'd find on an office calculator. Overall, I wouldn't say this thermometer is easy to use, but rather it is too simple to use.3. Accuracy Back to the water tests. Boiling water has a maximum temperature of 100 degrees C. I poured about 250ml of water in a utensil, boiled it and checked the temperature with a trusty and accurate MIG thermometer. The reading was always stable at 98.5 to 100 degrees C across multiple tests, given that the water was bubbling furiously. Then I checked the temperature of the same water, still boiling, with the Mextech thermometer. The maximum reading it gave me was 96.4 degrees C and it kept fluctuating between that and 93.7. The packaging claims that the accuracy is +/- 1 degree C up to +150 degrees C. However, I found that wasn't totally right. Compared to the MIG thermometer, the accuracy of the Mextech thermometer is off by a considerable magnitude for serious work.Temperature accuracy isn't generally a big deal for me primarily because I have an accurate and faster MIG thermometer with which I can compare and calibrate a digital thermometer like the Mextech every once in a while. However, for independent use, I do not recommend the Mextech thermometer. Inaccuracy of this magnitude is unacceptable for serious laboratory work and can result in potentially serious errors when working with dangerous chemicals.Now I agree that one can't say that all Mextech thermometers will be bad just because the one I bought was. But you can imagine that they have such a bad quality check process that they allowed a product with this level of inaccuracy to ship to a customer.For something like color negative film development, the recommended temperature accuracy for development chemistry is +/- 0.5 degrees C to +/- 1 degree C maximum. Even with the comparison and calibration with the MIG thermometer, I cannot use this thermometer for film development due to the huge magnitude of temperature fluctuations. But there's something even worse that I'm extremely sure applies to all of these thermometers made by Mextech:4. Build qualityThe most important point I want to talk about. This thermometer is rated for a very formidable temperature range of -50 degree C to +300 degree C. At low and sub-zero temperatures, I don't see any issues apart from possible inaccuracy and instability in a similar range as I talked about above. However, when the sensor probe is inserted in any liquid that has a temperature of >70 degrees C for more than 30 seconds, the plastic housing of the sensor probe starts to melt. It doesn't turn to liquid, but rather starts to become soft and in areas where the plastic meets the metal, you'll notice bubbling. If you hold the sensor probe submerged in boiling water at an angle for about one minute, you'll notice that the plastic part of the probe has acquired a bent shape. The heat from the liquid transfers to the metal sensor probe and there doesn't seem to be any sort of insulation between that and the plastic parts and therefore the heat is directly dissipated into the plastic. That is at 100 degrees C. I wonder how well (or horribly) this will perform at its advertised rating of +300 degrees C. Even though the sensor probe and electronics might have the capability to read temperatures up to +300 degrees C, the plastic will most certainly not survive 10 seconds.Overall, my thoughts and experiences about this piece have been negative. I will most probably return this back to the seller and look for a thermometer that is actually meant for professional use. Although the packaging mentions photography (implied film development and darkroom use) among other things like pharmaceutical, laboratory, process control, etc. it can't be relied upon. I don't think this is a tool for people who take their work seriously. It's neither accurate nor stable. It has poor build quality.The pros are: it's cheap and it could be great for kids who like doing science things. A digital thermometer is better than MIG (mercury in glass) thermometers for 2 big reasons: 1. mercury, 2. glass. Mercury isn't something you want to touch your skin. Although it is said that the amount of mercury from a broken thermometer isn't dangerous, precaution is better than care and so MIG thermometers should only be used and handled by adults and professionals. The glass is also very thin and fragile and won't survive a mildly strong bump on a rigid surface. As we all know, broken glass is not good for kids.The sensor probe of the Mextech thermometer is essentially a 5 inches long and 5 millimeters thick needle with a fairly sharp-ish tip so that might make it not so friendly for small children. Basically this is not for someone you wouldn't trust a knife or a pair of scissors with, like small children.If you're considering a good accurate and reliable thermometer for serious work, do not invest in this; you will be disappointed. Just spend some more money on genuine professional equipment.

Original Mextech product.Value for money.

Good quality have correct accuracy but you have to take care of it and it is not for measuring body temperature it is use for measuring room temperature

Works as advertised and is quite accurate. Happy with the purchase.

I have same model but new purchased is low intensity of display.