---
product_id: 5420113
title: "OTC 5025 Diesel Exhaust Fluid (DEF) Refractometer Kit"
brand: "otc"
price: "AR$532727"
currency: ARS
in_stock: true
reviews_count: 13
category: "Otc"
url: https://www.desertcart.com.ar/products/5420113-otc-5025-diesel-exhaust-fluid-def-refractometer-kit
store_origin: AR
region: Argentina
---

# 0.5% concentration scale accuracy Precision optical measurement Complete kit with tools & case OTC 5025 Diesel Exhaust Fluid (DEF) Refractometer Kit

**Brand:** otc
**Price:** AR$532727
**Availability:** ✅ In Stock

## Summary

> 🚛 Stay ahead of the curve—test your DEF like a pro!

## Quick Answers

- **What is this?** OTC 5025 Diesel Exhaust Fluid (DEF) Refractometer Kit by otc
- **How much does it cost?** AR$532727 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/5420113-otc-5025-diesel-exhaust-fluid-def-refractometer-kit)

## Best For

- otc enthusiasts

## Why This Product

- Trusted otc brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **User-Friendly & Fast:** Quick, clear readings with an easy-to-use scale and detailed quick start guide.
- • **All-in-One Portable Kit:** Includes dropper, lens cloth, screwdriver, and protective case for on-the-go testing.
- • **Save Thousands on Repairs:** Detect DEF contamination early to avoid costly engine derates and warranty disputes.
- • **Pinpoint DEF Concentration:** Achieve 99% accuracy with a precision optical refractometer designed for diesel exhaust fluid.
- • **Regulation-Ready Compliance:** Ensure your diesel engine meets EPA NOx emission standards effortlessly.

## Overview

The OTC 5025 Diesel Exhaust Fluid Refractometer Kit is a portable, precision optical tool that measures DEF concentration with 0.5% scale accuracy. Designed to help heavy-duty diesel operators comply with EPA NOx emission standards, it includes all necessary accessories for quick, reliable testing. Trusted by professionals to prevent costly engine issues, this kit ensures your SCR system runs optimally by verifying the critical 32.5% urea solution concentration.

## Description

The Refractometer is a portable, precision, optical instrument used for measuring the Diesel Exhaust Fluid (DEF) concentration. When a liquid sample is placed on the prism, the light passing through it is bent. The more concentrated the liquid, the more the light will bend. The Refractometer contains a reticle, or scale, that is enlarged through the eyepiece to measure this light. The values on the scale have been established to evaluate the DEF condition. EPA regulations require all diesel engines manufactured on or after January 1, 2010 to meet lowered NOx emissions standards. Most heavy duty engine (Class 7-8 trucks) manufacturers, have chosen to utilize SCR. This Includes Detroit Diesel (DD13, DD15, and DD16 models), Cummins (ISX line), PACCAR, and Volvo/Mack. SCR-equipped engines require the periodic addition of Diesel Exhaust Fluid (DEF, a urea solution) to enable the process. DEF is available in a bottle from most truck stops, and some have installed bulk DEF dispensers near the Diesel Fuel pumps. However, to ensure the proper operation of the SCR system, operators must ensure the DEF in their vehicle consists of a 32.5 percentage Urea/Water solution. It makes this a simple and quick process for an operator or technician. Scale: 0.5 percentage, line graduations 32.5 percentage, indicated scale 15-40 percentage, waterline, and 20 degree Celsius kit includes Refractometer, dropper, lens wipe cloth, instructions and quick guide, screwdriver and case.

Review: Functionality. - So easy to use, the pamphlet instruction is included, it cost less than you order directly from OTC. The glass screen show your DEF testing fluids very clearly and 99% accuracy, works as it design for.
Review: What a great tool to have at a good price - Just bought a new 2023 semi truck $220k didn’t even have 3k miles when a check engine light with poor def truck derated shop said def was contaminated. I got a bill of $1900. I sent bill to seller he paid the bill contamination is not cover under warranty somebody had to pay that bill truck got fixed bought this tool every jug I put in I test well 3k miles again check engine light poor def again I told shop I checked every jug bought def fluid from there parts counter well shop gave me a bill for $6,200 i checked fluid and showed my refractometerwell they started doing there job come to find out the builder of the truck for some reason caked on a bunch of grease on O-ring that goes on sensor that was leaking into the tank and creating false readings and that’s where the contamination was coming from. I suggest if you have a semi truck that uses DEF buy this tool it’s worth every penny. By the way, the $6200 bill got covered under warranty.

## Features

- The refractometer is a portable precision optical instrument used for measuring the diesel exhaust fluid concentration
- When a liquid sample is placed on the prism the light passing through it is bent and the more concentrated the liquid the more the light will bend
- The refractometer contains a reticle or scale that is enlarged through the eyepiece to measure this light and the values on the scale have been established to evaluate the DEF condition
- EPA regulations require all diesel engines manufactured on or after January 1 2010 to meet lowered NOx emissions standards
- Most heavy duty engine manufacturers have chosen to utilize SCR including Detroit Diesel DD13 DD15 DD16 Cummins ISX line PACCAR and Volvo-Mack

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0054WI5KQ |
| Best Sellers Rank | #121,428 in Automotive ( See Top 100 in Automotive ) #6 in Heavy Duty Vehicle Antifreeze, Coolant & Diesel Exhaust Fluid |
| Brand | OTC |
| Brand Name | OTC |
| Customer Reviews | 4.8 out of 5 stars 355 Reviews |
| Global Trade Identification Number | 00731413559846 |
| Included Components | Unit^Instruction Guide |
| Item Dimensions | 12.3 x 5.9 x 2.85 inches |
| Item Highlight | Includes Refractometer, Dropper, Lens Wipe Cloth, Instructions and Quick Start Guide, Screwdriver, and Case Item Highlight Includes Refractometer, Dropper, Lens Wipe Cloth, Instructions and Quick Start Guide, Screwdriver, and Case See more |
| Item Type Name | DEF Refractometer |
| Item Weight | 1 g |
| Item dimensions L x W x H | 12.3 x 5.9 x 2.85 inches |
| Manufacturer | OTC |
| Material | Glass, Metal, Plastic |
| Material Type | Glass, Metal, Plastic |
| Model | 5025 |
| Number of Items | 1 |
| Part Number | 5025 |
| UPC | 731413559846 |
| Unit Count | 1 Count |
| Warranty Description | 1 year manufacturer |

## Product Details

- **Brand:** OTC
- **Item Weight:** 1 g
- **Item dimensions L x W x H:** 12.3 x 5.9 x 2.85 inches
- **Material:** Glass, Metal, Plastic

## Images

![OTC 5025 Diesel Exhaust Fluid (DEF) Refractometer Kit - Image 1](https://m.media-amazon.com/images/I/81z5AAkks3L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Functionality.
*by D***T on October 23, 2025*

So easy to use, the pamphlet instruction is included, it cost less than you order directly from OTC. The glass screen show your DEF testing fluids very clearly and 99% accuracy, works as it design for.

### ⭐⭐⭐⭐⭐ What a great tool to have at a good price
*by E***S on February 25, 2023*

Just bought a new 2023 semi truck $220k didn’t even have 3k miles when a check engine light with poor def truck derated shop said def was contaminated. I got a bill of $1900. I sent bill to seller he paid the bill contamination is not cover under warranty somebody had to pay that bill truck got fixed bought this tool every jug I put in I test well 3k miles again check engine light poor def again I told shop I checked every jug bought def fluid from there parts counter well shop gave me a bill for $6,200 i checked fluid and showed my refractometerwell they started doing there job come to find out the builder of the truck for some reason caked on a bunch of grease on O-ring that goes on sensor that was leaking into the tank and creating false readings and that’s where the contamination was coming from. I suggest if you have a semi truck that uses DEF buy this tool it’s worth every penny. By the way, the $6200 bill got covered under warranty.

### ⭐⭐⭐⭐⭐ Works as advertized
*by S***T on July 9, 2021*

Easy to use and read display. Accuracy unknown for lack of a known calibration fluid other than water, but new package of Blue DEF checked good.

## Frequently Bought Together

- OTC 5025 Diesel Exhaust Fluid (DEF) Refractometer
- Performance Tool W16500 Professional DEF Tester (Disc Type DEF, Diesel Exhaust Fluid tester)
- EISCO Plastic Graduated Cylinder, 500mL - Class B - Stable Hexagonal Base - Premium Polypropylene - Lab Cylinder, Measuring Cylinder

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-09-27*