Can a tube be put on the end of the probe to be able to sample from areas too far down for the probe alone to reach?

Yes it can. The end of the probe has a barb so a 4-6mm ID tubing will work. Thank you

What is the indication if the O2 level is above 30%?

If above 30% indication is 30.0% and does not change unit after this.

can this device be used to warn of O2 depletion in a room where a liquid Nitrogen duer is stored?

Functionally speaking yes it could do that. However, for continuous room monitoring to alarm for oxygen depletion we recommend permanently fixed wall mount unit, like this guy here: https://www.amazon.com/dp/B0843JLSXS?ref=myi_title_dp

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Oxygen Detector + Pump | UK Calibration Certificate | USB Recharge | Sound, Light and Vibration Alarms | 0-30% O2 |

Oxygen Detector + Pump | UK Calibration Certificate | USB Recharge | Sound, Light and Vibration Alarms | 0-30% O2 |

Product ID: 83178213

Details

Alarm
LED Buzzer &
Brand
FORENSICS FD
Colour
Yellow
Item weight
130 Grams
Material
ABS
Operating humidity
<95%RH

🔋USB rechargeable battery

🚨Tri-mode alarm system

⚛️0.1% O2 resolution sensor

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€ 378.72

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Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚨 Detect with precision, act with confidence — your oxygen safety, upgraded.

PLUG CHARGE GO - Convenient USB recharge keeps you powered up without the hassle of battery replacements.
CERTIFIED ACCURACY - Comes with UK & USA calibration certificates for guaranteed reliability and compliance.
STAY ALERT STAY SAFE - Adjustable sound, light, and vibration alarms ensure you never miss critical oxygen level changes.
PRECISION YOU CAN TRUST - Electrochemical NANO-GAS sensor with ultra-fine 0.1% oxygen detection resolution.
BUILT FOR THE TOUGHEST CONDITIONS - Water-resistant, dustproof, and explosion-proof design for rugged professional use.

The Oxygen Detector + Pump by Forensics Detectors FD is a professional-grade, electrochemical sensor device calibrated for 0-30% oxygen detection with 0.1% resolution. It features tri-mode alarms (sound, light, vibration), USB rechargeable battery, and a rugged, water-resistant, dustproof, explosion-proof ABS casing. Certified with UK & USA calibration certificates and backed by a 1-year warranty, it’s engineered for reliable, on-the-go oxygen monitoring in demanding environments.

Specifications

ASIN	B07GM4NP3T
Alarm	LED, Buzzer & Vibration
Best Sellers Rank	1,057,876 in DIY & Tools ( See Top 100 in DIY & Tools ) 538 in Gas Detectors
Brand	FORENSICS DETECTORS FD
Colour	Yellow
Country of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (18)
Included Components	Gas Detector, Pump, Recharge Cable, Sling, User Manual, Calibration Cap and Calibration Certificate
Item Dimensions D x W x H	4.3D x 5.8W x 11H centimetres
Item Weight	130 Grams
Manufacturer	Forensics Detectors
Manufacturer Warranty Description	1 year manufacturer.
Material	ABS
Model Number	FD-90A-O2-PUMP
Number of Items	1
Operating Humidity	<95%RH
Part Number	FD-90A-O2-PUMP
Power source	Battery Powered
Product Style	Modern
Sensor Type	Electrochemical
Unit Count	1.0 count

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