---
product_id: 316185908
title: "PENN-PLAX Therma-Temp Floating Aquarium Thermometer – Mercury Free – Safe for Freshwater and Saltwater Fish"
brand: "penn-plax"
price: "$26.79"
currency: USD
in_stock: true
category: "Penn Plax"
url: https://www.desertcart.us/products/316185908-penn-plax-therma-temp-floating-aquarium-thermometer-mercury-free-safe
store_origin: US
region: United States of America
---

# Mercury-free safe design Optional suction cup mount Fast 5-sec response PENN-PLAX Therma-Temp Floating Aquarium Thermometer – Mercury Free – Safe for Freshwater and Saltwater Fish

**Brand:** penn-plax
**Price:** $26.79
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your aquatic world perfectly balanced—because your fish deserve the best!

## 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?** $26.79 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/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 & Sleek:** Slim 4.25-inch design fits seamlessly into any aquarium setup without clutter.
- • **Instant Precision:** Get reliable temperature readings in just 5 seconds—no more guessing!
- • **Versatile Placement:** Float freely or mount with the removable suction cup for easy access and visibility.
- • **Trusted Brand Quality:** Penn-Plax, a leader in pet care, delivers durability and accuracy you can count on.
- • **Eco-Safe & Fish-Friendly:** Mercury-free glass ensures a toxin-free environment for your freshwater and saltwater tanks.

## Overview

The PENN-PLAX Therma-Temp Floating Aquarium Thermometer offers quick, accurate temperature readings with a 5-second response time. Its mercury-free glass design ensures safety for both freshwater and saltwater fish. Featuring a removable suction cup, it can float freely or be mounted for convenience. Compact and reliable, this thermometer is a trusted choice for maintaining optimal aquarium conditions.

## 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.

## 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 |
| Additional Features | Floating Thermometer |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #19,221 in Pet Supplies ( See Top 100 in Pet Supplies ) #103 in Aquarium Water Quality Testing & Treatment |
| Brand Name | Penn-Plax |
| Color | Multicolor |
| Customer Reviews | 4.3 4.3 out of 5 stars (1,495) |
| Display Type | Analog |
| Global Trade Identification Number | 00030172371011 |
| Immersion Depth | 4.25 Inches |
| Included Components | Mercury-Free Floating Aquarium Thermometer |
| Indoor Outdoor Usage | Indoor |
| Item Length | 4.25 Inches |
| Item Type Name | Penn-Plax 54537101: Therma-Temp Floating Aquarium Thermometer |
| Item Weight | 0.01 Kilograms |
| LowerTemperature Range | 10 Degrees Celsius |
| Manufacturer | Penn Plax, INC. |
| Model | TF |
| Model Name | TF |
| Outer Material | Glass |
| Part Number | 54537101 |
| Product Care Instructions | Hand Wash Only |
| Resolution | 1°F / 0.5°C |
| Response Time | 5 seconds |
| Reusability | Single Use |
| Specification Met | Penn |
| Style Name | Floating Thermometer |
| UPC | 030172371011 |
| Unit Count | 1 Count |
| Upper Temperature Range | 110 Degrees Fahrenheit |

## 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/71-agAWfLXL.jpg)

## 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.us/products/316185908-penn-plax-therma-temp-floating-aquarium-thermometer-mercury-free-safe](https://www.desertcart.us/products/316185908-penn-plax-therma-temp-floating-aquarium-thermometer-mercury-free-safe)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-11-15*