Can you use on the 445815

This is the recommended calibration kit for 445815.

I need the instructions, can anyone supply these? I recently bought this through amazon. Can anyone help??

The instructions (from Extech) come with their meters, not the calibration jars. I use these standards with my Extech 445580, and combined, the meter and the calibration jars are effective. The instructions with the 445580 stress that the meter be given lots of time to equalize (40 minutes per jar!). I found it doesn't need quite that long, but definitely requires around 15-20 minutes in order to stabilize and give an accurate reading. Be patient.

Will the hole in the top accommodate a probe that is 3/4" in diameter?

Hello Mika,The opening on the RH300-Cal salt bottles are 0.5". A 0.75" probe will be too large.Best Regards

does it comes with nist certificate?

Hello, Thanks for your question, No, the Kit does not come with a NIST certificate. If you have any questions, please feel free to contact our tech support line at 866-477-3687 option 3

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Extech RH300-CAL Humidity Calibration Kit, 33% and 75% RH

Product ID: 10591866

Details

Battery Description
No batteries
Brand
Extech
Color
Black/Clear
Item Weight
0.02 kg
Mounting Type
Tabletop

💧33% & 75% RH salt solutions

📏Accurate, repeatable hygrometer calibration

🛠️Sealed calibration chamber included

$197.46

Duties & taxes included

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Description

💼 Calibrate like a pro, measure with confidence.

COMPACT DURABLE - Rugged, portable design built for field or lab use without compromise.
COST SAVING ACCURACY - Avoid costly sensor errors and maintain peak performance effortlessly.
PLUG PLAY CALIBRATION - No complex setup—just place your meter and get instant accuracy.
PRECISION YOU CAN TRUST - Stable humidity references ensure your readings never drift.
VERSATILE PRO GRADE TOOL - Perfect for HVAC, labs, QA teams, and facility managers demanding compliance.

The Extech RH300-CAL Humidity Calibration Kit includes 33% and 75% relative humidity salt bottles and a sealed chamber to create precise, stable environments for accurate hygrometer calibration. Designed for professionals in HVAC, laboratories, and quality assurance, this portable, durable kit simplifies calibration, ensuring reliable humidity measurements and compliance with industry standards.

Specifications

ASIN	B000GFIDK8
Battery Description	No batteries required
Best Sellers Rank	#650,722 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #70 in Humidifier Humidity Meters #918 in Humidifier Accessories
Brand Name	Extech
Color	Black/Clear
Customer Reviews	4.3 4.3 out of 5 stars (27)
Global Trade Identification Number	00793950433003
Included Components	Humidity Calibration Bottles
Item Highlight	33% and 75% RH salt bottles, sealed chamber, calibrates humidity meters/hygrometers/dataloggers
Item Weight	0.02 kg
Manufacturer	Extech
Model	RH300-CAL
Mounting Type	Tabletop
Number of Items	1
Number of Packs	1
Operating Humidity	33% to 75% relative humidity
Part Number	EXTRH300-CAL
UPC	796841972032 793950433003
Upper Temperature Range	60 °C
Warranty Description	6 Months Parts and Labor

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