Regardless which type meter you are using, you should not be getting a reading, if you do; the element is shorted and needs replacing
Spadepot.Com says
To test hot tub heating elements for integrity, use an ohm meter on its lowest setting. With the meter's test leads, measure the resistance between the two terminals as shown. The acceptable resistance range for heaters used in most hot tubs is between 9 - 12 ohms (a few may be as high as 25 ohms, depending upon kilowatt rating).
A reading which is too low indicates a bad unit: short circuit. A very high (or infinite) reading indicates a bad unit: open circuit or limited conductivity.