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The thermometer should be held vertically
Illuminance standard reference table:
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laboratory Multicolour Portable Ph Meter With Case Cover, 4X4X4 Cm v=cmzWDkOYTjM We take pride in deliveringlaboratory Multicolour Portable Ph Meter With Case Cover, 4X4X4 Cm Digital PH Tester Meter Pocket Pen Aquarium Pool Water Digital Tester This digital pen style pH meter is an ideal instrument for aquarium, fishing industry, swimming pool, school laboratory, food & beverage etc. Very excellent, accurate and durable. Note: The new digital tester shouldn't need to be adjusted. When you turn on the tester , you may find the measured value is not accurate
