Amprobe TMA-21HW Hot Wire Anemometer

Amprobe's TMA-21HW Hot Wire Anemometer with Temperature uses a bearing-free hot‑wire sensor and telescoping probe to deliver fast, accurate air velocity, volume, temperature, and humidity readings for HVAC/R work. It measures velocity from 0.10 to 30.00 m/s (0.2–110.0 km/h; 10–6000 ft/min; 0.10–59.0 knots; 0.12–68.00 mph), supports air-flow volume of 0–999,900 CFM or 0–999,900 CMM, and temperatures from -20°C to 60°C (-4°F to 140°F) with basic accuracy around ±0.5°C and ±0.9°F, while RH is shown 0–100% with ±3% RH. The unit features a triple 4‑digit LCD display, sampling at 1 Hz, and a response time under 2 seconds, plus 512 KB auto data-logging and 99‑set memory (with manual memory of 5×99). A USB interface enables PC software connection, and the probe extends 2.2 m (7.2 ft) with a 1.2 m (3.9 ft) reach, tip diameter 15.0 mm and base diameter 28.0 mm, weighing 165 g. Powered by six AAA batteries (included), it ships with a hard carrying case, USB cable, and CD software. Designed for indoor air quality and HVAC/R technicians, it supports measurements across residential, commercial, and industrial air systems for wind flow and temperature assessments.