What multimeter works well for this and how to add connectors for it?

Any meter what is going in the DC millivolt range.

How hot can the wire get? It's stainless and fiberglass, does it need shielded from flame?

I’ve had mine directly in the flame and glowing at 1900 degrees with no issues in the forge.

Is there a datasheet and user manual available?

The manufacturer can give you the answer.

is it ok if i use it for a max temp. of 800°c? (to unwax molds), I have seen people complaining about problems with higher temperatures

I do not know, it is reded for 100 C to 1250 C it should be working.

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3M K-Type Thermocouple 100mm Sensor Probe Temperature from -100°C to 1250°C

3M K-Type Thermocouple 100mm Sensor Probe Temperature from -100°C to 1250°C

Product ID: 37815787

Details

Brand
ZJIA
Centerline Length
100
Color
Silver
Connector Type
Spade
Manufacturer
SZZJ INC
Mounting Type
Free hanging

📏Compact 100mm probe length

🔩Durable 5mm stainless steel probe

🌡️Wide temp range -100°C to 1250°C

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Description

🌡️ Measure the extremes, own the precision.

TRUSTED 3 M QUALITY - Backed by a global leader in industrial sensors for reliable performance.
COMPACT YET POWERFUL - 100mm probe length fits tight spaces without compromising accuracy.
PRECISION THREAD FIT - 8mm thread size ensures secure, leak-proof installation every time.
EXTREME TEMPERATURE MASTERY - Handles from freezing -100°C to scorching 1250°C with precision.
RUGGED STAINLESS STEEL BUILD - Engineered for durability and corrosion resistance in demanding environments.

The 3M K-Type Thermocouple Sensor Probe offers an impressive operating temperature range from -100°C to 1250°C, housed in a durable 5mm stainless steel probe with a compact 100mm length and secure 8mm threading, making it ideal for professional-grade temperature monitoring in industrial and scientific applications.

Specifications

ASIN	B00OLIOTHM
Best Sellers Rank	#79,188 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #116 in Temperature Probes & Sensors
Brand Name	ZJIA
Centerline Length	100 Millimeters
Color	Silver
Connector Type	Spade
Customer Reviews	4.3 4.3 out of 5 stars (144)
Manufacturer	SZZJ INC
Model	021426
Mounting Type	Free hanging
Number Of Contacts	1
Number Of Poles	3
Number of Positions	3
UPC	702142602554
Unit Count	1.0 Count
Upper Temperature Rating	1250 Degrees Celsius

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