Shock Doctor Compression Knee Support Brace with Stay vs Zacurate Pro Series 500DL Fingertip Pulse Oximeter

What separates them

These two differ on 6 recorded specifications. The Shock Doctor Compression Knee Support Brace with Stay is ₹500 dearer.

Shock Doctor

Shock Doctor Compression Knee Support Brace with Stay

₹2,499

Stays and hinges are not the same thing, and the distinction decides whether this is the right product.

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Zacurate

Zacurate Pro Series 500DL Fingertip Pulse Oximeter

₹1,999

Competent hardware carrying two caveats worth knowing.

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Who the Shock Doctor Compression Knee Support Brace with Stay is for

Buy it if: Athletes wanting compression and mild support that fits under clothing.

Avoid it if: Anyone with a diagnosed ligament injury -- that needs a hinged brace, not stays.

Who the Zacurate Pro Series 500DL Fingertip Pulse Oximeter is for

Buy it if: Anyone who wants an FDA-cleared oximeter and does not need Indian regulatory approval.

Avoid it if: Anyone wanting a CDSCO-registered device, or a perfusion index to judge reading quality.

Specifications, side by side

6 of 18 rows differ. Differences first.

Specification	Shock Doctor Compression Knee Support Brace with Stay	Zacurate Pro Series 500DL Fingertip Pulse Oximeter
Price	₹2,499	₹1,999
Clinical validation	Not applicable -- this is an orthosis, not a measuring device	Manufacturer states testing against ISO 80601-2-61; no independent study published
Measurement range	Knee circumference 12 to 22 inches across five sizes	SpO2 70 to 100 percent; pulse rate 30 to 250 bpm
Power source	Not applicable	Two AAA cells, approximately 30 hours
Regulatory status	Not a notified medical device	US FDA cleared. Not CDSCO registered for the Indian market
Stated accuracy	Not applicable	Plus or minus 2 percent Arms for SpO2 between 70 and 100 percent, manufacturer stated
Stored readings	Not applicable	Last reading only
Connectivity	None	None
Warranty	1 Year Official Brand Warranty	1 Year Official Brand Warranty
Auto-off	not published	8 seconds without a finger
Difference from a hinged brace	Stays resist bending; hinges resist sideways movement. For ligament instability you need hinges	not published
Display	not published	Dual-colour LED, six orientations
Finger size	not published	Fits 0.3 to 1 inch thickness
Known limitation	not published	Nail polish, cold fingers and dark skin tone all reduce accuracy
Material	Four-way stretch fabric with a moisture-wicking lining	not published
Patella	Open, with a supportive buttress	not published
Perfusion index	not published	Not displayed -- so an unreliable reading looks like a good one
Sizing	Measured 10 cm above the knee centre	not published
Stays	Two flexible side stays -- not hinges	not published

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

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