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Description: RT300M can identify the vast majority of lamps, lights, the whole backlight, but the market is too much different beads, "The F team as much as possible to collect different types of beads, but can not guarantee that all LED have been identified. If you can't automatically identify it, please switch to manual mode for measurement. Manual mode switch back to automatic mode, need to enter the set state to AUo or pull out the tester AC plug Power off, and then the internal capacitance discharge then plug. RT300M, due to the high output of power, sets a 256 stage dimming, and as the current increases, the LED is bright. Gradually increase, when measuring, please protect the eyes, do not look at LED. RT300M gradually dropped to 150mA after 90 seconds in the 300mA roast machine, supporting a long time roaster. F "X baking machine test 200V backlight, 10 hours without pressure, but it is after all test tools, Try not to roast the machine for many times. Non professional, do not use it! Packing includes: 1 x LED LCD TV Backlight Tester 2 x Table pen