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

Oxygen O2 Detector Analyzer Pump With Probe By Forensics Usa

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Description

🕵️‍♂️ Detect with confidence, lead with precision.

RUGGED READY - Shockproof, waterproof, dustproof, and explosion-proof design with convenient belt clip for on-the-go professionals.
INSTANT READINESS - Turn ON and GO with factory calibration and zero/span adjustment options for hassle-free use.
TRIPLE ALERT SYSTEM - Customizable audible, visual, and vibration alarms keep you instantly informed of critical O2 levels.
PRECISION YOU CAN TRUST - NIST-calibrated electrochemical sensor ensures ±5% accuracy for reliable oxygen detection.
CERTIFIED QUALITY ASSURANCE - Comes with USA-made calibration certificate, 1-year warranty, and 100% product verification for peace of mind.

The FORENSICS DETECTORS FD Oxygen O2 Detector Analyzer is a professional-grade, NIST-calibrated electrochemical sensor device with 0.1% resolution and a 0-30% detection range. Featuring fast response times under 30 seconds, multi-mode alarms (sound, light, vibration), and a rugged, explosion-proof design, it’s engineered for reliable, on-the-go oxygen monitoring. Powered by rechargeable lithium-ion batteries and backed by a 1-year warranty and quality certification, it’s the trusted choice for safety-conscious professionals.

Specifications

ASIN	B07GM4NP3T
Alarm	Audible, Vibration, Visual
Best Sellers Rank	#449,585 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #221 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

Reviews

J**.

O2 leak tester

A great tool for use in Aviation in finding Oxygen system leaks. Works great so far

23.09.2024

A**W

Easy to use and USB can power forever

Easy to use and comes with calibration. USB power can keep it running forever for both pump and detector. Alarm is loud as intended. Great buy.

13.01.2019

T**Z

Great customer service

It works great and customer service is excellent!

18.12.2020

M**.

Great product with great value.

Great product.

9.04.2021

R**G

Great Product.

Does what it says it would do.

22.03.2022

J**T

Easy to setup

We have been using a Oxygen Gas Detector and Argon Analyzer for the last two years in our production line, giving us better control of the process. Their customer service is great. Their calibration service is USA NIST compliant.

20.05.2024

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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