Part Number - UTBI-001

HOBO TidbiT v2 Water Temperature Data Logger

Max Depth 1,000 ft

$185.00 USD
Only 3x4 cm, the tiny waterproof TidbiT v2 data logger measures temperatures over a wide range, providing 12-bit resolution and ±0.2 °C accuracy.

Important Information

Requires HOBOware software and either an Optic USB Base Station or HOBO Waterproof Shuttle (U-DTW-1). HOBOware Pro is required when using the HOBO Waterproof Shuttle. See compatible items below.

Compatible with


Only 3x4 cm, this tiny data logger measures temperatures over a wide range, providing 12-bit resolution and ±0.2 °C accuracy. Designed for outdoor and underwater environments, this logger is waterproof to 300 m (1000 ft). An optical USB interface lets you offload data in seconds.

Please note: A solar radiation shield is required to obtain accurate air temperature measurements in sunlight (assembly-required RS1 Solar Radiation Shield or pre-assembled M-RSA Solar Radiation Shield).

Diagram showing how an optical interface is used for retrieving data.


  • Onset's smallest temperature data logger
  • Waterproof to 300 meters (1,000 feet)
  • Data readout in less than 30 seconds via fast Optic USB interface


Temperature Sensor

Operation Range*
-20° to 70°C in air;
-4° to 158°F in air;
maximum sustained temperature of 30°C (86°F) in water*
±0.21°C from 0° to 50°C , see manual for plot
±0.38°F from 32° to 122°F , see manual for plot
0.02°C at 25°C , see manual for plot
0.04°F at 77°F , see manual for plot
Response Time
5 minutes in water; 12 minutes in air moving 2 m/sec;
20 minutes in air moving 1 m/sec (typical to 90%)
Stability (Drift)
0.1°C per year
0.18°F per year


Real-time Clock
±1 minute per month 0° to 50°C (32° to 122°F)
3 Volt lithium, non-replaceable
Battery Life (Typical Use)
5 years with 1 minute or greater logging interval
Memory (Non-volatile)
64K bytes memory (approx. 42,000 12-bit temperature measurements)
19.6 g
0.69 oz
3.0 × 4.1 × 1.7 cm (1.2 × 1.6 × 0.68 in.); mounting bail 4.6 mm (3/16 in.) diameter hole
Wetted Materials
Epoxy case
To 305 m (1000 ft.)
Logging Interval
Fixed-rate or multiple logging intervals, with up to 8 user-defined logging intervals and durations; logging intervals from 1 second to 18 hours. Refer to HOBOware software manual.
Launch Modes
Immediate start, delayed start, triggered start
Offload Modes
Offload while logging; stop and offload
Battery Indication
Battery level can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.
Environmental Rating
NIST Certificate
Available for additional charge
CE Compliance Mark

Compatible items

Compliance Certificates

$30.00 USD

Data Offload - Base Stations - Shuttles - Couplers

$15.00 USD

NIST Setup & Certifications

Protective Covers and Boots

$31.00 USD

Solar Radiation Shields

$149.00 USD
$100.00 USD

Data Offload - Base Stations - Shuttles - Couplers

$175.00 USD
$325.00 USD

Graphing & Analysis

$75.00 USD
$99.00 USD

What's in the box

  • TidbiT v2 (UTBI-001) Temperature Data Logger


TidbiT v2 Temp (UTBI-001) User's Manual

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HOBO® TidbiT® Temp Data Logger (UTBI-001) Quick Start

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