Alarm sounds when below 19% or above 23%.
eBay
Drager E-Cal Calibration System for Pac 1000/3000/5000/7000 Detector Please take a look at the actual pictures of the item you will receive. "The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies. If so, do not bid on this item unless you are an authorized purchaser. Payment Please submit the payment within 48 hours after you have purchased the item. Internatinal buyers welcome. We accept paypal, all major credit cards, wire transfers. If you have problem submiting payment in the timeframe please let us know. We can ship using Fedex or UPS please contact us in advance if you need a specific company. Everything we sell we do have in stock. If you purchasing multiple listings please wait until we send you com.
eBay