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 -

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

🔋USB rechargeable battery

🚄Response <30s

⚛️0.1% O2 resolution

R8359

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🕵️‍♂️ Detect with precision, act with confidence.

PLUG PUMP DETECT - Integrated 0.5LPM pump with probe for fast, continuous sampling—turn it on and start measuring immediately.
PRECISION YOU CAN TRUST - NIST-calibrated electrochemical sensor ensures ±5% accuracy for reliable oxygen detection.
RUGGED READY FOR ACTION - Shockproof, waterproof, dustproof, and explosion-proof design with convenient belt clip for on-the-go professionals.
CERTIFIED QUALITY ASSURANCE - Comes with USA calibration certificate, 1-year warranty, and 100% product verification for peace of mind.
INSTANT ALERTS ZERO DOWNTIME - Multi-mode alarms (sound, light, vibration) with digital timestamp keep you ahead of hazardous levels.

The FORENSICS DETECTORS FD Oxygen O2 Analyzer is a professional-grade, NIST-calibrated gas detector featuring a fast-response electrochemical sensor with 0.1% resolution across 0-30% O2 range. Equipped with a built-in pump, USB rechargeable battery, and multi-mode alarms (sound, light, vibration), it offers rugged durability (shock, water, dust, explosion proof) and certified quality assurance, making it the go-to tool for safety-conscious professionals.

Specifications

ASIN	B07GM4NP3T
Alarm	Audible, Vibration, Visual
Best Sellers Rank	#503,659 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #241 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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R8359

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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

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