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- SAVE $2.37$15.50$17.87Industrial Test Systems SenSafe 480125 Iron Check, 2 Minutes and 30 Seconds Test Time, 0-5ppm Range (Pack of 30 Test Strips)Amazon
- $19.00Industrial Test Systems WaterWorks 480048 Mercury Check, 2 Minutes and 30 Seconds Test Time, 50-1000 ppb Range (Bottle of 50)Amazon
- $17.643in1 Alarm - Door Ajar Alarm, Door Chime with Delay, 0/5/10/30/60 Seconds, 2/5 Minutes, Close Door Reminder, 80 to 120 dB, Time Delay Door Alarm When Left Open for Freezer, Home, Shop. (White)Amazon