AD: Affirmative Defense

EC: Electrical Conductivity

IMO: In my opinion

LEO: Law Enforcement Officers or Officials

LED: Light Emitting Diode

LEP: Light Emitting Plasma

MM: Medical Marijuana

MMMA: Most common use on this site is Michigan Medical Marijuana Association. May also mean Michigan Medical Marijuana Act

PH: pH is a measure of the acidity or basicity of a solution.

PPM: Parts Per Million

Rep: Reputation. points given out by fellow members rating a post. These can be positive or negative.

RO: Reverse osmosis water.