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I TRIED THIS UNIT FOLLOWING THE INSTRUCTIONS CLOSELY. AFTER SEVERAL TRIES TO CALIBRATE THE UNIT, I REALIZED IT SIMPLY DOES NOT WORK. ONE DISPLAY SAYS WARMING UP BUT NEVER CHANGES. I PURPOSLY PUT IT RIGHT NEXT TO SOME CLEANING SUPPLIES WHILE USING THEM. THE FUMES WERE TERRIBLE BUT THE UNIT DIDN'T REGISTER ANYTHING. IT SAID THE AIR QUALITY WAS PERFECT. THE INSTRUCTION MANUAL IS ALSO NOT ADEQUATE. AS IS TYPICAL WITH CHINESE PRODUCTS. WHOEVER TRANSLATES THESE, DOES NOT REALLY KNOW ENGLISH AND NEEDED INFORMATION IS ALWAYS LACKING. A GOOD EXAMPLE IS FORMYLDAHIDE. IS DOES NOT GIVE ANY NUMBER AS TO HOW MANY PPM IS SAFE. I WAITED ALMOST 6 WEEKS FOR THIS AND I AM TOTALLY DISSAPOINTED.
Verified purchase: Yes | Condition: New
Each time the unit is turned on it needs to be calibrated. They instructions for calibration are extremely vague, it’s not an easy process.
Verified purchase: Yes | Condition: New
I am very impressed on how sensitive I is. It's very accurate and easy to use.
Verified purchase: Yes | Condition: New
meets my expectations
Verified purchase: Yes | Condition: New
Good product.
Verified purchase: Yes | Condition: New