Insant Ocean Hydrometer vs. Aquatic Gardens Hydrometer/Thermometer

[$eaba$$]

So at my LFS they have both the instant ocean hydrometer, which is the swing arm type, and there is also a cheaper hydrometer/thermometer bobber made by Aquatic Gardens. Is the bobber type on much less accurate than the swing arm or?

[Squawkbert]

IMHO

refractometer>>>bobber>>swing arm

[$eaba$$]

alrighty anybody else??