description electromagnetic field meter the extech emf510 measures energy from electromagnetic fields (emf) and electrical signals and is sensitive to extremely low frequency levels (elf). the built-in single-axis sensor is ideal for monitoring power lines, electrical appliances, fans and blowers, and electrical circuits in two ranges with miligauss and micro-tesla units. the emf510 features a large backlit lcd for viewing in dimly lit areas, an ergonomic compact design with wrist strap, auto power off, and min/max function. california proposition 65 warning. features measure emf/elf levels in miligauss (mg) or microamps (μt) up to 2000 mg (200μt) with two ranges to choose from built-in single axis sensor provides basic accuracy reading of ±5% 30 to 300hz bandwidth backlit display to view in dimly lit areas specifications acme tools brand name extech acme tools part number emf510 assembled weight (lbs) 1 audible alarm no battery life varies battery type aaa california proposition 65 warning required yes case included no color / finish green country of origin taiwan data hold yes depth (in) 1.5 globaltradeitemnumber (gtin) 00793950225103 internet product code (ipc) cfc7089f32b length (in) 9 manufacturer warranty 1 year material plastic measurements magnetic fields operating temperature range 0 to 50°c (32 to 122°f) package contents meter, wrist strap and 3 aaa batteries package weight 1 package weight (lbs) 1 temperature range 0 to 50°c (32 to 122°f) upc 793950225103 weight (lbs) 1 weight (oz) 16 width (in) 4