Tru Opto-Rice-Grain-Meter-Bulb-Tru Opto-101-001-The-Tru Opto-Rice-Grain-Meter-Bulb-1-5V-is-a-micro-miniature-filament-lamp-that-features-a-bulb-measuring-just-1-4mm-diameter-Suitable-for-a-very-wide-range-of-industrial-&-hobbyist-applications-such-as-LCD-backlighting-general-indication-close-proximity-illumination-model-railways-dolls-houses-Tru Opto-Rice-Grain-Meter-Bulb-1-5V