TE-5012 Elapsed Time Indicator Mechanical E.T.I. registers how long the
System ran (non re-settable) 00000.00 hours and tenths of hour.
TE-5013 Elapsed Time Indicator Mechanical E.T.I. Registers how long the
PM10 System ran 0000.0 minutes. Similar to TE-5012 ETI except
this product features a re-settable clock.
TE-3000 Filter Media Holder/Filter Paper Cartridge facilitates the
changing of filters by keeping contamination off the clean filter