The Manfrotto 438 Compact Leveling Head provides fast leveling for tripods. This is ideal for tripods without built-in levels or when you don’t want to adjust each leg individually. It fits between the center column via a 3/8 screw. For tripods with no bowl mount, this provides a bowl solution with the benefit of also having an adjustable center column, or neck. Tripods with bowl style mounts lack the presence of a neck. For those of you who want or need this feature, this leveler is a nice resolution. This leveler has a max payload of 33 lbs, an range adjustment of 10º a bubble level and is only 2″ tall.
There are a few other options for a Tripod Leveling base starting from $80 dollars upwards to more than $300. The Manfrotto is a nice balance between build quality and price at about $92 dollars. Below are a few other options for a Tripod leveling base.
SunwayFoto Leveler with Clamp
SUNWAYFOTO 120mm Tripod Leveling Lever Clamp Arca Compatible Sunway