Metler Toledo RAININ Pipet-Lite SL Series Magnetic-Assisted Manual Single-Channel Pipette

Overview

The Mettler Toledo RAININ Pipet-Lite SL Series represents a rigorously engineered evolution in manual liquid handling—designed specifically for laboratories demanding high repeatability, operator ergonomics, and long-term reliability across routine and high-frequency pipetting tasks. Unlike conventional air-displacement pipettes relying solely on mechanical spring resistance, the SL Series integrates a proprietary magnetic-assisted piston drive mechanism that fundamentally reduces axial force required during aspiration and dispensing. This principle leverages controlled magnetic repulsion between permanent magnets embedded within the piston assembly and housing, delivering consistent, low-friction linear motion without mechanical wear or hysteresis. The result is a pipette architecture optimized for precision volumetric delivery in accordance with ISO 8655-2 (volumetric performance) and ISO 8655-5 (user-related requirements), while significantly mitigating cumulative musculoskeletal strain associated with repetitive pipetting.

Key Features

• Magnetic-Assisted Piston Drive: Reduces plunger activation force by up to 70% compared to standard manual pipettes—enabling sustained accuracy over extended workflows without operator fatigue.
• LTS (Low-Touch Tip Ejection): Engineered tip cone geometry and optimized ejection force profile reduce tip ejection effort by up to 80%, minimizing wrist flexion and thumb pressure during high-throughput plate filling or serial dilution protocols.
• Ergonomic Gun-Style Body with Finger Hooks: Lightweight polymer construction (average weight: 85–115 g depending on volume range) and contoured finger rests support neutral hand posture and natural thumb alignment, validated through biomechanical assessment per ISO 11228-3 (manual handling of loads).
• Silicone Damping Pad: Integrated beneath the plunger cap to absorb impact energy during rapid dispensing cycles, protecting the operator’s thumb joint and enhancing tactile feedback consistency.
• Volumetric Lock Mechanism: Tamper-resistant, tool-free volume lock prevents accidental setting changes during transport or multi-user lab environments—critical for compliance with SOP-driven workflows.
• Quick-Release Tip Ejector Lever: Optimized lever ratio and pivot geometry enable full tip ejection with minimal finger travel and force, compatible with both universal and filtered LTS tips.

Sample Compatibility & Compliance

The Pipet-Lite SL Series is validated for use with aqueous, viscous (e.g., glycerol solutions up to 50% v/v), and volatile liquids (e.g., ethanol, acetone) when operated within specified temperature and humidity ranges (15–30°C, 30–70% RH). All models comply with ISO 8655-2:2022 for gravimetric accuracy and precision testing, with typical CV values ≤0.6% at nominal volume and ≤1.2% at 10% of nominal volume (per ISO 8655-5 Annex A). The LTS tip interface meets ISO 8655-3:2022 dimensional tolerances for tip cone compatibility, ensuring interchangeability with certified LTS-compatible consumables from major global suppliers. Device construction adheres to IEC 61010-1 safety standards for laboratory equipment, and documentation supports audit readiness under FDA 21 CFR Part 11 (when used with compliant electronic log systems) and EU Annex 11 requirements.

Software & Data Management

While the SL Series is a fully manual instrument without onboard electronics or connectivity, its design enables seamless integration into digitally governed laboratory environments. Each pipette carries a unique serialized identifier laser-engraved on the barrel—facilitating asset tracking in CMMS or LIMS platforms. Calibration records, maintenance logs, and usage history can be maintained in accordance with ISO/IEC 17025:2017 clause 6.4.10 (equipment management) and GLP principles. Optional accessories—including CR-7 rotating stands and HU-M3 magnetic mounts—are designed for traceable placement and orientation control, supporting visual inspection protocols during internal audits. For labs implementing digital calibration management, RAININ provides downloadable calibration templates aligned with ISO/IEC 17025 and NIST-traceable reference standards.

Applications

The SL Series serves as a primary liquid handling tool across diverse life science and quality control settings: molecular biology workflows (PCR setup, restriction digests, library preparation), clinical diagnostics (sample aliquoting, reagent dispensing), pharmaceutical QC (dissolution testing, assay standard preparation), and academic research requiring high-fidelity volumetric transfer. Its ultra-low-force operation makes it particularly suitable for applications involving fragile cell suspensions, enzymatic reactions sensitive to shear stress, and microvolume assays where thermal drift or user-induced variability must be minimized. Fixed-volume variants (FL and FSL series) are deployed in regulated environments requiring locked dispensing volumes for critical process steps—such as ELISA plate coating or reference standard dilution in GMP manufacturing.

FAQ

Is the Pipet-Lite SL Series compliant with ISO 8655?
Yes—fully compliant with ISO 8655-2 (performance requirements), ISO 8655-3 (tip interface), ISO 8655-5 (user ergonomics and usability), and ISO 8655-6 (calibration procedures).
Can SL pipettes be calibrated in-house?
Yes—calibration is performed gravimetrically using Class E2 or better weights and ISO 4787-compliant volumetric glassware; RAININ provides detailed calibration SOPs and uncertainty budgets.
What is the service interval recommendation?
Annual verification is recommended for routine use; biannual verification is advised for high-frequency (>200 operations/day) or regulated environments.
Are LTS tips required?
LTS tips are strongly recommended to realize the full ergonomic and accuracy benefits; however, universal-fit tips may be used with reduced tip ejection efficiency and potential seal variability.
Does the magnetic mechanism require maintenance or battery replacement?
No—the magnetic-assisted drive contains no consumable components, batteries, or firmware; it operates entirely passively and requires only periodic cleaning and lubrication per RAININ Technical Bulletin TB-SL-001.