AS ONE TD384-WH Programmable Countdown Timer

Overview

The AS ONE TD384-WH is a compact, standalone programmable countdown timer engineered for precision timing in laboratory, industrial, educational, and quality control environments. Designed with functional ergonomics and operational reliability in mind, it operates on a single AAA alkaline battery and delivers consistent timekeeping without dependency on external power sources or network connectivity. Its measurement principle is based on quartz crystal oscillator circuitry, ensuring high stability and low drift across ambient temperature ranges typical of indoor laboratory and production floor conditions. The device features a clear LED display with large, high-contrast digits for easy readability at a glance—critical in fast-paced workflows where visual confirmation must be immediate and unambiguous. Unlike software-based timers, the TD384-WH provides deterministic, real-time countdown execution with no latency, making it suitable for applications requiring strict adherence to time-critical protocols, such as reaction monitoring, sample incubation intervals, equipment duty-cycle management, and standardized test procedures.

Key Features

• Integrated magnetic backing and fold-out plastic stand for flexible mounting on metal surfaces or stable tabletop positioning
• High-output audible alarm (≥70 dB at 10 cm) with sharp tonal profile optimized for audibility in moderately noisy environments (e.g., cleanrooms, QC labs, workshops)
• Dedicated repeat function enabling automatic re-triggering after alarm activation—ideal for recurring interval tasks without manual reset
• Intuitive single-button interface with tactile feedback for setting, starting, pausing, and resetting; no menu navigation required
• Robust ABS resin housing offering chemical resistance to common lab solvents and mechanical resilience against incidental impact or vibration
• Factory-calibrated quartz timing circuit with long-term accuracy specification compliant with IEC 60870-5-104 timing tolerances for auxiliary instrumentation

Sample Compatibility & Compliance

The TD384-WH does not interface directly with samples or analytes; rather, it serves as an independent timing reference within broader procedural workflows. It is compatible with all standard laboratory and manufacturing protocols requiring discrete, user-defined time intervals—from ASTM E2917 (Standard Practice for Determining Time Intervals in Thermal Analysis) to ISO/IEC 17025-accredited calibration laboratories’ internal timing SOPs. While not a regulated medical device, its design adheres to general electrical safety principles outlined in IEC 61010-1 for laboratory equipment. No hazardous substances are used in construction per RoHS Directive 2011/65/EU. Battery compartment meets UL 4200A requirements for consumer battery-powered devices.

Software & Data Management

This is a hardware-only, non-networked timing instrument with no embedded firmware update capability, USB interface, or data logging functionality. All operations are executed locally via physical button inputs, eliminating cybersecurity concerns associated with connected devices. As such, it requires no software installation, driver configuration, or IT infrastructure integration. Audit trails are maintained manually through procedural documentation (e.g., lab notebooks, electronic batch records), aligning with GLP and GMP expectations for traceability of timing events in regulated environments. The absence of digital memory ensures zero risk of data corruption, unauthorized access, or timestamp tampering.

Applications

• Timing incubation periods in microbiological testing (e.g., ISO 4833-1:2013 enumeration protocols)
• Controlling exposure duration during UV sterilization validation cycles
• Monitoring hold times in pharmaceutical stability studies per ICH Q5C guidelines
• Enforcing dwell time compliance in surface cleanliness verification (e.g., ATP swab processing)
• Supporting standardized test durations in materials testing per ASTM D638 or ISO 527 tensile protocols
• Facilitating timed steps in ELISA, PCR setup, or chromatographic system equilibration procedures

FAQ

Does the TD384-WH support multiple simultaneous timers?
No. It is a single-channel countdown timer with one active timing session at a time.
Is the alarm sound customizable?
No. The alarm emits a fixed-frequency tone at ≥70 dB; pitch and duration are not adjustable.
Can the device be wall-mounted?
It lacks dedicated mounting holes or adhesive backing, but the integrated magnet allows secure attachment to ferromagnetic vertical surfaces.
What is the battery life under typical usage?
With average use (≤5 activations/day), the included AAA battery provides approximately 6–12 months of operation before replacement.
Is calibration certification available?
AS ONE does not supply factory calibration certificates for this model; however, users may perform periodic verification using NIST-traceable stopwatches or time signal references per ISO/IEC 17025 Section 6.5.