Braintree Scientific TK8851 Handheld Rodent Thermometer
| Brand | Braintree Scientific |
|---|---|
| Origin | USA |
| Manufacturer Status | Authorized Distributor |
| Product Origin | Imported |
| Model | TK8851 |
| Price | Upon Request |
| Temperature Range | –200 °C to 390 °C (probe-dependent) |
| Temperature Accuracy | ±(0.1% of reading + 0.7 °C) |
| Display Refresh Rate | 2.5 Hz |
| Operating Temperature | 0 °C to 50 °C |
| Operating Relative Humidity | <80% RH (non-condensing) |
| Power Supply | 9 V alkaline battery |
| Probe Interface | Universal T-type thermocouple input |
| Display | Backlit LCD (30 mm H × 51 mm W) |
| Timer Function | Start-triggered, displayed concurrently with temperature |
| Channels | 1 |
Overview
The Braintree Scientific TK8851 Handheld Rodent Thermometer is a purpose-engineered, single-channel digital thermometer designed specifically for non-invasive core body temperature monitoring in preclinical rodent models—primarily rats and mice. It operates on the principle of thermoelectric voltage measurement via standardized T-type thermocouples, leveraging Seebeck effect-based signal transduction to deliver rapid, repeatable thermal readings under controlled laboratory conditions. Unlike general-purpose industrial thermometers, the TK8851 integrates biological workflow considerations: its ergonomic handheld form factor, tactile rubberized keypad, and dedicated timer function align with IACUC-compliant handling protocols and minimize animal restraint time. The device does not incorporate internal temperature sensing; instead, it serves as a high-fidelity readout interface for externally connected, sterilizable T-type probes—ensuring traceability, probe interchangeability, and compliance with GLP documentation requirements for longitudinal in vivo studies.
Key Features
- Ergonomic, lightweight handheld design optimized for one-handed operation during animal handling procedures
- Backlit LCD display (30 mm height × 51 mm width) with 2.5 Hz real-time refresh rate for immediate visual feedback
- Integrated start-triggered digital timer synchronized with temperature acquisition—enabling precise recording of measurement duration per subject
- Universal T-type thermocouple input compatible with all ASTM E230-compliant miniature rodent probes (e.g., fine-wire, rectal, or esophageal configurations)
- Calibration-traceable accuracy of ±(0.1% of reading + 0.7 °C) across the full operational range (–200 °C to 390 °C), referenced to NIST-traceable standards
- Robust housing rated for continuous use in standard vivarium environments (0 °C to 50 °C, <80% RH non-condensing)
- Powered by a single 9 V alkaline battery with low-battery indicator and auto-power-off after 10 minutes of inactivity
Sample Compatibility & Compliance
The TK8851 is validated for use with small mammalian subjects weighing ≥15 g (e.g., C57BL/6 mice, Sprague-Dawley rats). Its compatibility extends to all T-type thermocouples meeting ASTM E230 Class 1 tolerances, including stainless-steel-shielded, PTFE-insulated, and disposable probe variants. The instrument supports adherence to NIH OLAW and AAALAC International guidelines for minimally disruptive physiological monitoring. While the TK8851 itself is not FDA-cleared medical equipment, its measurement methodology conforms to ISO/IEC 17025 principles for testing laboratories when used with certified probes and documented calibration records. No firmware or hardware modifications are required to meet institutional GLP audit requirements for temperature data integrity.
Software & Data Management
The TK8851 operates as a standalone analog-to-digital converter with no embedded memory or wireless transmission capability—ensuring electromagnetic compatibility in MRI-adjacent or electrophysiology suites. All temperature and timer data are displayed exclusively on the LCD; manual transcription into electronic lab notebooks (ELNs) or LIMS systems is required. For automated data capture, users may integrate the TK8851 with third-party analog output modules (e.g., National Instruments USB-TC01) via optional voltage-output adapters. Calibration logs, probe serial numbers, and operator IDs must be recorded externally to satisfy 21 CFR Part 11 audit trails where electronic records are mandated.
Applications
- Core body temperature assessment during pharmacokinetic/pharmacodynamic (PK/PD) studies
- Hypothermia/hyperthermia induction monitoring in thermoregulation research
- Post-anesthetic recovery tracking in surgical models
- Environmental stress response evaluation (e.g., cold exposure, circadian rhythm disruption)
- Quality control verification of incubator, metabolic cage, or anesthesia system thermal stability
- Training tool for veterinary and preclinical technician certification programs
FAQ
Is the TK8851 calibrated before shipment?
Yes—each unit undergoes factory calibration at two points (0 °C and 100 °C) using NIST-traceable reference baths, and includes a certificate of conformance.
Can I use K-type or J-type probes with this thermometer?
No—the TK8851 accepts T-type thermocouples only; using other types will produce erroneous readings due to differing Seebeck coefficients.
What is the recommended recalibration interval?
Braintree Scientific recommends annual recalibration or prior to critical study initiation, aligned with institutional QA policies.
Does the device support data logging or PC connectivity?
Not natively—the TK8851 is a dedicated readout instrument without memory, USB, or Bluetooth interfaces.
Are replacement probes available directly from Braintree Scientific?
Yes—TK8851-compatible T-type probes (including sterile, reusable, and single-use variants) are stocked under separate SKUs and shipped with individual calibration certificates.
