---
product_id: 16904815
title: "Sper Scientific 736740 Mason's Hygrometer"
brand: "sper scientific"
price: "Bs.481"
currency: BOB
in_stock: true
reviews_count: 11
category: "Sper Scientific"
url: https://www.desertcart.bo/products/16904815-sper-scientific-736740-masons-hygrometer
store_origin: BO
region: Bolivia
---

# Wet bulb tech for precise humidity Safe, vivid red liquid display Dual temp scales -10/50°C & 10/120°F Sper Scientific 736740 Mason's Hygrometer

**Brand:** sper scientific
**Price:** Bs.481
**Availability:** ✅ In Stock

## Summary

> 💧 Stay ahead of the climate curve with precision you can trust!

## Quick Answers

- **What is this?** Sper Scientific 736740 Mason's Hygrometer by sper scientific
- **How much does it cost?** Bs.481 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/16904815-sper-scientific-736740-masons-hygrometer)

## Best For

- sper scientific enthusiasts

## Why This Product

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

## Key Features

- • **Mercury-Free Safety:** Uses vibrant red liquid, ensuring eco-friendly and safe operation without mercury risks.
- • **Battery-Free Operation:** Reliable, maintenance-free performance with zero battery dependency.
- • **Compact & Durable Design:** Lightweight 3.8 oz tabletop model built with tough plastic for everyday resilience.
- • **Precision Dual-Scale Readings:** Seamlessly switch between Celsius and Fahrenheit for versatile monitoring.
- • **Innovative Wet Bulb Technology:** Accurately measures humidity by comparing wet and dry bulb temperatures.

## Overview

The Sper Scientific 736740 Mason's Hygrometer is a compact, battery-free device that measures humidity using wet and dry bulb temperatures. Featuring dual temperature scales (-10/50°C and 10/120°F) and a safe red liquid display, it offers accurate, eco-friendly readings ideal for professionals seeking reliable environmental data.

## Description

Measure Humidity - Mason's Hygrometer - Red Liquid. One thermometer bulb is kept constantly wet by a siphon reservoir while the other gives a dry temperature reading. Humidity is obtained by comparing the two readings on the enclosed chart. The red liquid masons hygrometer uses a safe and easy to read red liquid in place of the usual mercury. Dual scales of -10/50°C and 10/120°F.

Review: A good instrument/good price - A good instrument/good price, seems accurate and is easy to use. Some say it looks cheap due to the plastic but the plastic is tough
Review: A little expensive but I want to know te humidity - Like other reviews it came with broken tubes so I used replacement tube I found ang I glued them in place

## Features

- Measure Humidity - Mason's Hygrometer - Red Liquid
- Dual scales of -10/50°C and 10/120°F
- High quality
- Red Liquid

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00N5IRZS4 |
| Battery Description | No batteries required |
| Best Sellers Rank | #443,407 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #169 in Weather Hygrometers |
| Brand | Sper Scientific |
| Color | White |
| Date First Available | September 16, 2008 |
| Item Weight | 3.8 ounces |
| Item model number | 736740 |
| Manufacturer | Sper Scientific |
| Mounting Type | Tabletop |
| Product Dimensions | 2.87 x 1.26 x 11.97 inches |
| Temperature Accuracy | 5.56 |
| UPC | 077754662617 696738569263 |
| Upper Temperature Rating | 120 Degrees Fahrenheit |

## Product Details

- **Battery Description:** No batteries required
- **Brand:** Sper Scientific
- **Color:** White
- **Item Weight:** 3.8 Ounces
- **Mounting Type:** Tabletop

## Images

![Sper Scientific 736740 Mason's Hygrometer - Image 1](https://m.media-amazon.com/images/I/51pLwX2A6YL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: How often do you need to refill the bottle at different humidity levels?**
A: Please note I added a 30mm fan to move air across the wick. With humidity the 45% range and the fan operating, I need to add water about every 4 days.

## Customer Reviews

### ⭐⭐⭐⭐⭐ A good instrument/good price
*by D***. on May 19, 2016*

A good instrument/good price, seems accurate and is easy to use. Some say it looks cheap due to the plastic but the plastic is tough

### ⭐⭐⭐⭐ A little expensive but I want to know te humidity
*by T***I on September 3, 2023*

Like other reviews it came with broken tubes so I used replacement tube I found ang I glued them in place

### ⭐⭐⭐⭐⭐ Great little device
*by J***E on March 15, 2016*

Great little wet-bulb dry-bulb. It works well and is a great conversation piece. I enlarged the tiny chart provided and keep it near the hygrometer to help explain the readings.

## Frequently Bought Together

- Sper Scientific 736740 Mason's Hygrometer
- Apera Instruments Premium-Series PH60S Food pH Pocket Tester Kit, Swiss Spear pH Electrode, ±0.01 pH Accuracy, -2.00-16.00 pH Range (AI313)
- Weigh Boats Medium (100ml, 125 Pack) Disposable Plastic Trays for Scale, Anti-Static Square Tray Weighing Dishes, Polystyrene Lab Dish for Powder Weight, Mixing Epoxy, Food Sample Container, Pour Boat

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-03-19*