Review on 🌡️ INFURIDER YF-1800 Digital Infrared Thermometer (-58°F-3272°F), Non-Contact Laser Temperature Gun - DS=50:1, IR Pyrometer with Adjustable Emissivity, High Temperature Gauge Meter - Ideal for Forge Industry by James Eledge

To install the battery you first have to use a tiny screwdriver to loosen the smallest screw. I managed without losing a screw, but they really should give you a few. Second, the thing won't turn off and the battery is dead. The instructions are minimal and in small print. The worst is that the support is provided 24/7 via an invalid email address. I would not recommend Revain selling this product without warning. It is not for those without great manual dexterity and lots of screws. I will try another battery and see if the one I have is defective. I will probably return it. If I hear from the company soon I will re-read this review but not hold my breath.