Dr Trust Signature Series Fingertip Pulse Oximeter (210) vs Vissco Functional Hinged Knee Support with Adjustable Range of Motion

These two differ on 6 recorded specifications. The Vissco Functional Hinged Knee Support with Adjustable Range of Motion is ₹100 dearer.

Dr Trust

Dr Trust Signature Series Fingertip Pulse Oximeter (210)

₹1,199

Plus or minus 2 percent Arms sounds tight until you notice what it means: a displayed 94 percent could be 92.

Vissco

₹1,299

The hinges are the whole difference, and the reason to pay three times a plain knee cap.

Buy it if: Anyone monitoring a respiratory condition at home who wants a reading they can sanity-check.

Avoid it if: Anyone expecting hospital-grade certainty -- home oximeters are screening tools, not diagnostics.

Buy it if: Anyone with ligament instability or recovering from a knee injury who needs lateral support.

Avoid it if: Anyone with simple arthritic ache -- a plain elastic knee cap costs a third as much and does the same thing.

6 of 17 rows differ. Differences first.

Specification	Dr Trust Signature Series Fingertip Pulse Oximeter	Vissco Functional Hinged Knee Support with Adjustable Range of Motion
Price	₹1,199	₹1,299
Clinical validation	Accuracy verified against ISO 80601-2-61, the pulse oximeter standard	Not applicable -- this is an orthosis, not a measuring device
Measurement range	SpO2 35 to 100 percent; pulse rate 30 to 250 bpm	Knee circumference 12 to 20 inches across four sizes
Power source	Two AAA cells, approximately 30 hours	Not applicable
Regulatory status	CDSCO registered; CE marked	Manufactured to Indian orthotic standards; not a notified medical device
Stated accuracy	Plus or minus 2 percent Arms for SpO2 between 70 and 100 percent	Not applicable
Stored readings	Last reading only	Not applicable
Connectivity	None	None
Warranty	1 Year Manufacturer Warranty	1 Year Manufacturer Warranty
Difference from a knee cap	not published	Hinges resist sideways movement; a plain elastic cap only compresses
Display	Colour OLED, four orientations	not published
Hinges	not published	Bilateral metal, with stops
Known limitation	Nail polish, cold fingers and dark skin tone all reduce accuracy	not published
Material	not published	Neoprene-free breathable laminate
Open patella	not published	Yes, relieves pressure on the kneecap
Perfusion index	Displayed -- a low value means the reading is unreliable	not published
Response time	Under 10 seconds	not published
Sizing	not published	Measured 15 cm above the knee centre, not at the kneecap

Every row is a figure one or both products record. A blank is a figure the catalogue does not hold, not a zero.