STS Large Seal Tester for Gas Filters

• Used for ‘fitment testing’ on half and full face respirators
• Use only when testing Gas Filters
• When wearing the respirator, fit tester over the gas filter and inhale
• If ‘leakage’ occurs around mask it is not fitted properly

Step 1 – Pinch the tube of fitness checker
Step 2 – Inhale to make sure no air is leaking between face and respirator