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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FORENSICS DETECTORS FD - OXYGEN O2 Detector Analyzer + PUMP with Probe by FORENSICS - USA NIST Calibrated - USB Recharge - Sound, Light and Vibration Alarms - 0-30% O2 -

Product ID: 86330420

Details

Alarm
Audible Visual
Brand
FORENSICS FD
Color
YELLOW
Item Weight
130 Grams
Material
ABS
Operating Humidity
95 percent

🎆Multi-mode alarms

🚄Response <30s

⚛️0.1% O2 resolution

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Description

⚡ Stay Ahead of Danger with Precision Oxygen Detection!

RUGGED READY - Shockproof, waterproof, dustproof, and explosion-proof design built for demanding environments.
PLUG PUMP PLAY - USB rechargeable with integrated pump (0.5LPM) for fast, on-the-go oxygen analysis.
PRECISION YOU CAN TRUST - NIST-calibrated electrochemical sensor delivers ±5% accuracy for reliable oxygen detection.
CERTIFIED QUALITY ASSURANCE - Comes with calibration certificate, 1-year warranty, and 100% USA-tested reliability.
INSTANT ALERTS ZERO DOWNTIME - Audio, visual, and vibration alarms with digital timestamp keep you ahead of hazardous levels.

The FORENSICS DETECTORS FD Oxygen O2 Detector Analyzer combines ultra-precise NIST-traceable electrochemical sensing with a powerful integrated pump and multi-mode alarms. Designed for professionals who demand fast, reliable oxygen level monitoring in harsh conditions, it features USB recharge, rugged durability, and comes fully certified with a 1-year warranty.

Specifications

ASIN	B07GM4NP3T
Alarm	Audible, Vibration, Visual
Best Sellers Rank	#275,688 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #155 in Gas Detectors & Alarms
Brand	FORENSICS DETECTORS FD
Color	YELLOW
Customer Reviews	4.3 4.3 out of 5 stars (19)
Enclosure Material	ABS
Item Weight	130 Grams
Manufacturer	FORENSICS
Mfr Part Number	FD-90A-O2-PUMP
Model Number	FD-90A-O2-PUMP
Operating Humidity	95 percent
Power Source	Battery Powered
Product Style	Modern
Sensor Type	Electrochemical
Unit Count	1.0 Count

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€ 366.86

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Portugal.

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TrustScore 4.5 | 7,300+ reviews

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3 weeks ago

Meera L.

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