Select from the following list of accessories:

1. SENSOR HOLDER - MODEL ASH
2. DEWSMART SENSOR HOLDER - MODEL ADSH
3. PRESSURE REGULATORS - MODEL APR
4. PRESSURE GAUGES - MODEL APG
5. FILTER UNIT - MODEL AFU
6. FLOW METER - MODEL AFM
7. FLOW INDICATOR - MODEL AFI
8. PRESSURE DEWPOINT CALCULATOR - MODEL APDC
9. ZENER BARRIER UNIT - MODEL AZB