304 Stainless Steel—Stainless steel bowls resist corrosion and chemicals.

Fixed Bowl—Dippers with a fixed bowl are safe for use with food—they don’t have pins or other small parts that might break off. They’re easier to pour and collect samples with than dippers with a swivel bowl because you have control over how the bowl moves.

Swivel Bowl—Dippers with a swivel bowl let you sample from almost any angle. The bowl stays upright even when you move the handle, so there’s little risk of spilling when you move samples. However, you need two hands to empty them.