If you need to measure length, width, area in the usual way, then this laser rangefinder will be a good purchase. And if you want to measure, determine by the Pythagorean theorem, also measure depth and angle, then you should think about purchasing. (Although errors in determining heights can only be in my device) As for the discrepancy of -3 mm, this is fixable. Calibration in this device is carried out from -7 to +7 mm. I found the discrepancy in a test with a laser rangefinder from another manufacturer and a classic metal tape measure of not cheap quality. Photo below. I hope I helped you with your choice.
Digital multimeter RGK DM-12
6 Review
🌬️ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review
🌡️ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review
🔍 Dioxide Controller for Digital Gas Monitoring
5 Review