If there is too much moisture or humidity present within plastic granules prior to injection moulding, then imperfections such as `blow holes` can result. Spot checks using an insertion type handheld instrument on delivery from the supplier, or just prior to use can prevent quality problems.

Applications: ERH in plastic raw materials (beads, granules, etc) 
Excess free moisture causes cavities during moulding process as water boils off.
  
Products 
Transmitters 
Portable