---
product_id: 316185908
title: "PENN-PLAX Therma-Temp Floating Aquarium Thermometer – Mercury Free – Safe for Freshwater and Saltwater Fish"
brand: "penn-plax"
price: "€ 18.70"
currency: EUR
in_stock: true
reviews_count: 5
category: "Penn Plax"
url: https://www.desertcart.sk/products/316185908-penn-plax-therma-temp-floating-aquarium-thermometer-mercury-free-safe
store_origin: SK
region: Slovakia
---

# Floats in fresh & saltwater Removable suction cup mount Mercury-free precise temp reading PENN-PLAX Therma-Temp Floating Aquarium Thermometer – Mercury Free – Safe for Freshwater and Saltwater Fish

**Brand:** penn-plax
**Price:** € 18.70
**Availability:** ✅ In Stock

## Summary

> 🌡️ Float your fish tank’s vibe with precision and style!

## Quick Answers

- **What is this?** PENN-PLAX Therma-Temp Floating Aquarium Thermometer – Mercury Free – Safe for Freshwater and Saltwater Fish by penn-plax
- **How much does it cost?** € 18.70 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/316185908-penn-plax-therma-temp-floating-aquarium-thermometer-mercury-free-safe)

## Best For

- penn-plax enthusiasts

## Why This Product

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

## Key Features

- • **Compact & Clear:** Slim 4.25-inch profile with vibrant liquid indicator for quick, accurate readings at a glance.
- • **Trusted Quality:** From PENN-PLAX, a leader in premium pet supplies trusted by aquarists worldwide.
- • **Dual Habitat Ready:** Perfectly calibrated for both freshwater and saltwater tanks, keeping all fish comfortable.
- • **Safe & Sustainable:** Mercury-free design ensures eco-friendly, non-toxic monitoring for your aquatic friends.
- • **Versatile Placement:** Floats freely or mounts securely with the optional suction cup for effortless temperature checks.

## Overview

The PENN-PLAX Therma-Temp Floating Aquarium Thermometer offers mercury-free, reliable temperature readings for both freshwater and saltwater tanks. Featuring a removable suction cup for flexible placement, its compact design ensures easy monitoring while floating safely inside your aquarium. Trusted by pet enthusiasts, it combines safety, accuracy, and convenience in one sleek tool.

## Description

Therma-Temp presents the Floating Aquarium Thermometer by PENN-PLAX. These aquarium thermometers are mercury free, and are designed for a quick, easy, and reliable temperature readings. They’re safe to use inside both freshwater and saltwater fish tanks.Optional Suction Cup: Each Floating Aquarium Thermometer comes with an optional suction cup, which allows you to place it alongside the tank’s walls for even easier access for a temperature reading. The suction cup mount is removeable, and the thermometer should float on its own.Please Note: Please place the thermometer vertically inside your fish tank. This allows the colored liquid to pool at the bottom, and give an accurate temperature reading. Some settling may have occurred during the delivery process, but the interior liquid will return to the bulb once it’s set into a vertical position.Measurements: Overall = 0.5” (W) x 0.8” (D) x 4.25” (H) Suction Cup = 0.8” (Dia)Shop PENN-PLAX for All Your Pet’s Needs: PENN-PLAX is a manufacturer and distributor of top quality pet supplies, who specialize in creating excellent pet products for animals, both great and small.

Review: Works well so far. Suction cup is strong and far better then my last thermometer! Sitting comfortably in the green zone for my fish. Arrived at below 0°c on my doorstep and is now 23°c, so I know it's working perfectly.
Review: A mi me ha funcionado Perfecto.

## Features

- DESIGNED TO FLOAT IN AQUARIUMS: Our Floating Aquarium Thermometers are mercury free, and are designed for a quick, easy, and reliable temperature readings. They’re safe to use inside both freshwater and saltwater fish tanks.
- OPTIONAL SUCTION CUP: Each Floating Aquarium Thermometer comes with an optional suction cup, which allows you to place it alongside the tank’s walls for even easier access for a temperature reading. The suction cup mount is removable, and the thermometer should float on its own.
- PLEASE NOTE: Please place the thermometer vertically inside your fish tank. This allows the colored liquid to pool at the bottom, and give an accurate temperature reading. Some settling may have occurred during the delivery process, but the interior liquid will return to the bulb once it’s set into a vertical position.
- MEASUREMENTS: Overall = 0.5” (W) x 0.8” (D) x 4.25” (H) / Suction Cup = 0.8” (Dia)
- SHOP PENN-PLAX FOR ALL YOUR PET’S NEEDS: PENN-PLAX is a manufacturer and distributor of top quality pet supplies, who specialize in creating excellent pet products for animals, both great and small.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002568UE |
| Allergen Information | Allergen-Free |
| Batteries Included | No |
| Best Sellers Rank | #58,421 in Pet Supplies ( See Top 100 in Pet Supplies ) #268 in Aquarium Water Quality Testing & Treatment |
| Care instructions | Hand Wash Only |
| Color | Multicolor |
| Customer Reviews | 4.3 4.3 out of 5 stars (1,321) |
| Date First Available | 16 August 2012 |
| Item Weight | 10 g |
| Item model number | TF |
| Number of Items | 1 |
| Outer Material | Glass |
| Pet Life Stage | All Life Stages |
| Pet Type | small animals |
| Product Dimensions | 2.54 x 2.54 x 10.16 cm; 10 g |
| Quantity | 1 |
| Special Features | Floating Thermometer |
| Specific Uses | Indoor |
| Specification Met | Penn |
| batteries required | No |

## Product Details

- **Age range (description):** All Life Stages
- **Brand:** Penn-Plax
- **Colour:** Multicolor
- **Included components:** Mercury-Free Floating Aquarium Thermometer
- **Special features:** Floating Thermometer

## Images

![PENN-PLAX Therma-Temp Floating Aquarium Thermometer – Mercury Free – Safe for Freshwater and Saltwater Fish - Image 1](https://m.media-amazon.com/images/I/616q8s5Nh2L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by H***S on 15 December 2020*

Works well so far. Suction cup is strong and far better then my last thermometer! Sitting comfortably in the green zone for my fish. Arrived at below 0°c on my doorstep and is now 23°c, so I know it's working perfectly.

### ⭐⭐⭐⭐⭐ Review
*by P***. on 30 May 2021*

A mi me ha funcionado Perfecto.

### ⭐⭐⭐⭐⭐ Review
*by Z***H on 15 January 2026*

Great therm, simple to use and is very accurate. Floats or comes with a suction cup. It IS hard to read though, you can shine your phone light on it to see better.

## Frequently Bought Together

- PENN-PLAX Therma-Temp Floating Aquarium Thermometer – Mercury Free – Safe for Freshwater and Saltwater Fish
- API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored
- PAIZOO Fish Tank Digital Thermometer Accurate LED Display to ±0.9°F Tank Thermometer Aquarium Temperature Measurement Suitable for Fish, Axolotl, Turtle or Aquatic

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.sk/products/316185908-penn-plax-therma-temp-floating-aquarium-thermometer-mercury-free-safe](https://www.desertcart.sk/products/316185908-penn-plax-therma-temp-floating-aquarium-thermometer-mercury-free-safe)

---

*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-01-22*