GOYOJO Water Activity Meter, Small Plant Moisture Mete Tools, Adopt Non-Conductive Humidity Sensor, ±0.02aw high-Precision Measurement, Precise Analysis for Agriculture Fast Testing &Reliable Results

Got this for testing water activity in dehydrated foods to prevent mould issues. I really like the compact design, which makes it extremely convenient for travel and it does not take up much space to store between uses. It was very easy to calibrate using a homemade testing solution (they have a video in the advertisement showing you how to make your own solution and how to adjust the machine) and after doing so, it has been providing consistent readings for food and when testing again with the solution. Testing the water activity with this machine is extremely straightforward. In the same video that shows you how to make your own solution instead of buying it, which can be quite costly, they also show you how to perform the testing. The build quality is good and it comes with three testing containers plus a decent storage case. Very pleased with this selection.

I started making my own beef jerky and dried fruits at home, but I was always unsure if they were safe to store. This water activity meter solved that problem completely. Now I can test every batch and know for certain when my food is ready for packaging. The device is incredibly easy to use. You place your food sample in the small dish, close the chamber, and wait about five minutes. The screen displays the numbers clearly, so reading results is never confusing. I really like how portable it feels because I can easily move it around or pack it away when not needed. Getting started was simple. I tested it first with distilled water to check accuracy, and everything worked perfectly. The meter includes a thermometer which helps me make sure conditions are right for testing. It beeps when the reading is done, so I can work on other things while waiting. What impressed me most is how this changed my food preparation. My jerky stays fresh much longer now because I'm not guessing anymore. The texture comes out better too since I know exactly when to stop drying. Everything tastes great and lasts for months without any spoilage issues. The carrying case protects the meter nicely between uses. Battery life is excellent, lasting through many tests without needing attention. The price is reasonable compared to what professional equipment costs, yet it gives me the accuracy I need for home food preservation. Anyone who makes dried foods regularly should have one of these. It takes the guesswork out completely and gives you confidence in your results

This water activity meter is a convenient and reliable tool for checking moisture levels in jerky, dried fruits, grains, and more. It delivers quick readings with a solid accuracy of ±0.02 AW, which helps ensure food stays safe and shelf-stable. The non-conductive humidity sensor works well and doesn’t require complicated setup. Its digital display is clear, making the results easy to read even in low-light environments. The device feels lightweight and portable, great for home use or small food businesses. Calibration is simple, and the meter maintains consistent performance over time. It provides a good balance between price and functionality for everyday moisture testing. Overall, a dependable tool for monitoring water activity and improving food quality control

good tester for quality control. Fairly easy to use

I tried calibrating it and it is just not possible. I used NaCl saturated solution for 0.75 point and distilled water for 1.0 With highest correction distilled water cannot reach 1.0 - with the highest correction it is 0.97 at most. And if I calibrate it to 0.75 then distilled water reads at 0.94. So its readings are useless and cannot be trusted. I tried contacting support over email - no response. Over whatsapp they asked me to contact them on different email but nobody replied. UPDATE: after this review they finally answered. They requested me to take endless videos recording device in measuring process. Asked that I take uninterrupted videos (suggests that I was swapping samples off camera). 5 minutes measuring time? Lie! From their own words "For 0.75 Aw calibration solutions, a waiting time of at least 30 minutes is required to reach thermal and humidity equilibrium. Five minutes is insufficient." I bought calibrated Aw solution and it was measuring 0.72 with highest correction applied. This is just garbage. They declined to admit that device is defective and kept pulling tricks on me just to not replace the device.