10pcs LM337T LM 337T 3 Terminal Negative Adjustable Output Voltage Regulator,1.5A,TO 220AB. auspowers_batchthree short press this button to B0CPZZC4FM short press this button to enable or disable the sound alarm Measurement Unit Switch Short press this button to switch between the unit of electromagnetic field strength (mG and μT) and the electric field strength (V M) Temperature & Data Hold Switch Long press the button for 2 seconds to switch between temperature unit ℃ & ℉Short press this button to freeze the instant reading on the screen Maximum Measurement Mode & Light Power Long press this button for 2 seconds to turn ON OFF the backlight and flashlightShort press this button for maximum measure mode and freeze the max reading on the screen Read more WIDE VARIETY OF APPLICATIONS TECHNICAL PARAMETER ✔Electromagnetic field strength measurement Range: 0 Short Press Switch Button Functions: Short press the reading light’s switch button which is on the head of the reading light has the following functions: Short press the switch button for the first time 2V and 37V 10pcs LM337T LM 337T 3 Terminal Negative Adjustable Output Voltage Regulator