AS ONE WT-100 Waterproof Digital Thermometer

Overview

The AS ONE WT-100 Waterproof Digital Thermometer is a compact, handheld precision temperature measurement instrument engineered for reliable performance in demanding environments where moisture exposure is routine—such as food processing lines, cold chain logistics, pharmaceutical storage areas, and laboratory wet benches. Unlike standard thermometers, the WT-100 features an IP67-rated sealed housing that ensures full protection against dust ingress and immersion in water up to 1 meter for 30 minutes, enabling consistent operation during routine cleaning, sanitization, or accidental submersion. Its core sensing element employs a high-stability NTC thermistor with fast thermal response (<3 seconds to 90% of final reading in still air), calibrated traceably to NIST-traceable reference standards. The device operates on a single CR2032 coin-cell battery and delivers direct-reading Celsius output across a standard operating range of –20 °C to +100 °C (–4 °F to +212 °F), optimized for HACCP-critical applications requiring rapid verification of time–temperature compliance.

Key Features

• IP67-certified waterproof and dustproof enclosure for continuous use in washdown and high-humidity environments
• LED display with large, high-contrast digits (12 mm height) for clear readability under low-light or gloved-hand conditions
• Auto-power-off function after 10 minutes of inactivity to extend battery life (typical battery life: >12 months at 1 reading/hour)
• Stainless steel probe tip (304 SS) with integrated sensor junction for mechanical durability and corrosion resistance
• RoHS 2 (EU Directive 2015/863) compliant construction, free of lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE
• Ergonomic, tapered body design (70 × 40 × 175 mm) optimized for one-handed operation and pocket portability

Sample Compatibility & Compliance

The WT-100 is designed for non-invasive surface contact measurement and direct insertion into semi-solid or liquid media—including food products, culture media, coolant solutions, and ambient air. It does not support wireless data transmission or probe interchangeability; its fixed-sensor architecture ensures metrological stability and eliminates calibration drift associated with detachable probe interfaces. While the WT-100 itself does not include built-in data logging (a feature reserved for the WT-300 variant), its real-time readings are fully compatible with external manual recording protocols required under HACCP Principle 4 (Monitoring Procedures) and ISO 22000:2018 Clause 8.5.2. The device meets general-purpose accuracy requirements per IEC 60751 Class B (±0.5 °C from 0 °C to +100 °C), and its construction materials comply with FDA 21 CFR §177.2600 for indirect food contact surfaces.

Software & Data Management

The WT-100 operates as a standalone, firmware-based instrument with no embedded software, driver dependencies, or connectivity interfaces (e.g., USB, Bluetooth, or RS-232). As such, it requires no installation, configuration, or cybersecurity validation—making it suitable for regulated environments where IT infrastructure restrictions apply. All measurements are displayed locally in real time; users must manually transcribe values into electronic logs (e.g., LIMS, Excel, or paper-based HACCP records). For laboratories operating under 21 CFR Part 11 or EU Annex 11, the WT-100 may be deployed within a validated workflow when paired with documented procedures for operator training, daily verification using NIST-traceable reference thermometers, and periodic recalibration at accredited facilities (recommended annually or per internal SOP).

Applications

• Verification of critical control points (CCPs) in HACCP plans—e.g., post-cook holding temperatures (>75 °C), refrigerated transport validation (≤4 °C), and frozen storage monitoring (≤–18 °C)
• Temperature mapping of incubators, stability chambers, and cold rooms per ISO 14644-3 and USP
• Batch release testing of aqueous pharmaceutical preparations and biologics
• Field-based environmental monitoring in agriculture, aquaculture, and HVAC commissioning
• Education and vocational training in food safety, microbiology, and quality assurance curricula

FAQ

Does the WT-100 support data export or PC connectivity?
No—the WT-100 is a dedicated display-only instrument with no serial, USB, or wireless interface.
Is calibration certificate included with purchase?
A factory calibration report (non-accredited) is provided; accredited calibration per ISO/IEC 17025 requires separate service arrangement.
Can the WT-100 be used for measuring internal food temperatures?
Yes—its stainless steel probe is rated for direct insertion into cooked meats, dairy products, and prepared meals, provided surface sanitation is performed before and after use.
What is the recommended recalibration interval?
AS ONE recommends annual recalibration or prior to first use following any physical impact or prolonged exposure above 85 °C.
Is the battery user-replaceable?
Yes—the CR2032 battery is accessible via a screw-secured rear cover and requires no tools for replacement.