EXTECH Instruments HW30 HeatWatch Humidity and Temperature Stopwatch

Price: $58.99 - $56.18
(as of Dec 25, 2025 01:23:26 UTC – Details)


This HW30 multi-function stopwatch displays a digital up/down timer, temperature, humidity and heat index. The heat index measurement shows how hot it feels when humidity is combined with the actual temperature. Ideal for use in hot weather conditions. Additional features include a 12/24-hour clock, stopwatch, 30 lap/split memory and programmable alarm. HW30 Humidity/Temperature HeatWatch comes with lanyard, battery, and operating instructions.
Is Discontinued By Manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 3.1 x 2.6 x 0.8 inches; 0.71 ounces
Manufacturer recommended age ‏ : ‎ 36 months – 10 years
Item model number ‏ : ‎ HW30
Batteries ‏ : ‎ 1 Lithium Metal batteries required. (included)
Date First Available ‏ : ‎ April 20, 2004
Manufacturer ‏ : ‎ Extech
ASIN ‏ : ‎ B00023RYPO
Best Sellers Rank: #308,156 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #2,135 in Thermometers & Weather Instruments
Customer Reviews: 4.4 4.4 out of 5 stars (87) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Heat Index Calculator & Alarm – Monitors heat index (70-122 °F / 22-50 °C) and triggers a programmable audible alarm to help prevent heat stress in outdoor or humid conditions.
Multi-Mode Stopwatch & Timer – Features stopwatch/chronograph (1/100-sec), 10-hour countdown timer with alert, plus up/down timer, calendar, and dual 12/24-hour clock modes.
Lap/Split Memory with Recall – Store up to 99 laps or 30 lap/split records, with recall of fastest, slowest, and average laps—for training, industrial timing, or lab use.
Temperature & Humidity Display – Displays ambient temperature (14-122 °F / -10-50 °C) with ±3 °F accuracy and humidity (1-99 % RH), automatically calculating heat index.
Compact, Ready-To-Use Design – Lightweight (≈3 oz / 85 g) handheld form, powered by a single 3 V CR2032 battery, includes lanyard, durable build, and large digital display.