ANNMETER Digital Illuminance Meter, AN-881D Handheld Light Calibrator, 0.1~400,000 Lux Meter, Lumen Tester with 270° Rotatable Detector for Outdoor, Photography, Planting

Digital Lux/Foot Candle Light Meter, AIOMEST Illuminance Lumen Tester 0.01~400,000 Lux, Handheld Luxometro AI-881D for LED Plant Grow Lighting, Luxmeter w/Data Logging & Rotatable Detector

Amazon Basics 48-Pack AA Alkaline High-Performance Batteries, 1.5 Volt, 10-Year Shelf Life