---
product_id: 295022856
title: "RH300-CAL Humidity Calibration Kit for Extech 445715"
price: "¥23985"
currency: JPY
in_stock: true
url: https://www.desertcart.jp/products/295022856-rh300-cal-humidity-calibration-kit-for-extech-445715
store_origin: JP
region: Japan
---

# RH300-CAL Humidity Calibration Kit for Extech 445715

**Price:** ¥23985
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** RH300-CAL Humidity Calibration Kit for Extech 445715
- **How much does it cost?** ¥23985 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/295022856-rh300-cal-humidity-calibration-kit-for-extech-445715)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

RH300-CAL Humidity Calibration Kit for Extech 445715

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Extech |
| Item Weight | 0.02 Kilograms |
| Mounting Type | Tabletop |
| Operating Humidity | 33% to 75% relative humidity |
| Manufacturer | Extech Instruments |
| UPC | 796841972032 793950433003 |
| Global Trade Identification Number | 00793950433003 |
| Part Number | EXTRH300-CAL |
| Item Weight | 0.704 ounces |
| Product Dimensions | 7.5 x 3.5 x 2.4 inches |
| Country of Origin | China |
| Item model number | RH300-CAL |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Included Components | Humidity Calibration Bottles |
| Batteries Included? | No |
| Batteries Required? | Yes |
| Warranty Description | 6 Months Parts and Labor |

## Images

![RH300-CAL Humidity Calibration Kit for Extech 445715 - Image 1](https://m.media-amazon.com/images/I/81u-bRK4WrL.jpg)

## Questions & Answers

**Q: Can you use on the 445815**
A: This is the recommended calibration kit for 445815.

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

**Q: Will the hole in the top accommodate a probe that is 3/4" in diameter?**
A: Hello Mika,The opening on the RH300-Cal salt bottles are 0.5". A 0.75" probe will be too large.Best Regards

**Q: does it comes with nist certificate?**
A: 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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**Shop now:** [https://www.desertcart.jp/products/295022856-rh300-cal-humidity-calibration-kit-for-extech-445715](https://www.desertcart.jp/products/295022856-rh300-cal-humidity-calibration-kit-for-extech-445715)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-24*