factory equipment inspection, and educational demonstrations where portable measurement and data logging capabilities are critical this handheld field tester includes protective casing and 100 data point storage for on site and long term and educators requiring electromagnetic radiation detection in physics experiments, control, or education The ST8819A High distinctness Meter delivers accurate measurements ( 0.01mT resolution) with its advanced, ideal for detecting / dynamic fields in labs and industrial settings coupled with wide pattern detection from 0 2000mT for versatile field testing applications, Manufacturer: HDOYTXXM