MicroSpacer for Metered Dose Inhalers. The MicroSpacerÂ® fits most Metered Dose Inhalers (MDI). Easily drops into bag, pocket or purse, and costs much less than similar devices. Small, convenient to carry, MicroSpacerÂ® is dishwasher safe, latex free and provides anti-static delivery of your medication. MicroSpacer for Metered Dose Inhalers is the spacer device only and the Metered Dose Inhalers are not included.