# Water test kit Tetra Tetra Test NO3- — Nitrate (NO3−) measurement, 39 ml

**URL:** https://aio.lv/en/product--tetra-tetra-test-no3-3-rea--1012777
**Data updated:** 2026-03-11 11:41 (EET)
**Category:** Aquarium Supplies
**Manufacturer:** Tetra
**Manufacturer code:** Tetra Test NO3- 3 Rea.
**EAN:** 4004218744837
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 19.99 €
**Prices and availability valid until:** 2026-07-29 23:59
**Price without VAT (21%):** 16.52 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--tetra-tetra-test-no3-3-rea--1012777

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

Tetra Test NO3- is a liquid water test kit for measuring nitrate (NO3−) concentration in aquariums and ponds. The kit contains reagents for multiple tests with a total volume of 0.039 L and provides colorimetric results to monitor nitrate levels, support water quality management and guide maintenance such as water changes and filtration adjustments.

## Long description

Tetra Test NO3- is a liquid water test kit designed to measure nitrate (NO3−) concentration in aquariums and garden ponds. The kit contains reagents in liquid form with a total volume of 39 ml and provides colorimetric results that allow hobbyists and professionals to monitor nitrate levels accurately. Regular nitrate measurement helps assess biological load, the effectiveness of filtration and maintenance actions such as water changes.
Advantages
The test kit delivers clear colorimetric results that are easy to compare against a reference scale, enabling fast assessment of nitrate concentration. Its liquid reagents are formulated for repeated use, providing multiple individual tests from the supplied volume. The kit is compact and suitable for storage with other aquarium supplies, and it supports routine water quality monitoring without the need for electrical equipment.
Suitable for
 Freshwater aquariums
 Saltwater and marine aquariums where nitrate monitoring is required
 Garden ponds and outdoor water features
 Routine water maintenance and troubleshooting of water quality issues
Key specifications
 Measured parameter: Nitrate (NO3−)
 Form: Liquid reagent
 Total reagent volume: 39 ml
 Result type: Colorimetric comparison against a reference scale
 Intended use: Multiple individual tests suitable for regular monitoring
How to use
Collect a sample of aquarium or pond water in a clean container according to the kit instructions. Add the specified number of reagent drops to the sample, mix as directed and wait the indicated reaction time for the color to develop. Compare the resulting color with the included reference scale to determine the nitrate concentration. Rinse any test vessels after use and store reagents in a cool, dry place away from direct sunlight.
Usage recommendations
Test nitrate levels regularly as part of routine maintenance; higher nitrate readings indicate the need for partial water changes, review of feeding practices, or adjustments to biological filtration. Follow handling and storage instructions to maintain reagent accuracy and discard reagents past their recommended shelf life.

## Specifications

| Feature | Value |
|---|---|
| Volume | 0.039 L |
| Product type | Water test kit |
| Measured parameters | Nitrate (NO3–) |
| Suitable for aquarium water | Yes |
| Suitable for freshwater aquarium | Yes |
| Suitable for marine aquarium | Yes |

## FAQ

### How much does the Tetra Test NO3- water test kit cost, and is it available for purchase?

The price is 19.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 10 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 15.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Tetra products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Tetra service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

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