Calibration material delivery devices and methods

A device comprising:

• a first portion configured to be grasped by a hand of a user;
• and
• a second portion comprising:
• a reservoir containing a first control material, wherein the control material comprises a target analyte of a known or a predetermined concentration;
• and
• a flexible neck configured to permit relative movement between the first portion and the reservoir, wherein the flexible neck comprises a first narrow neck region, a second narrow neck region, and an enlarged neck region between the first and second narrow neck regions.